o大范圍流行的?para-oparadropo空投，空降oparachuteo降落傘oparalogismo不合邏輯的推論表示“降落傘”oparagono典范oparadoxo矛盾的說法oparadigmo范例，示范oparapoliticalo半政治的表示“在旁邊”oparastatalo半官方的?pn-,n-opansophico全知的opanegyrico頌詞；頌揚opanoramao全景，概觀opandemicoamericano泛美的?over-ooverhaulo徹底檢修ooverthrowo推翻ooverturno顛覆oovercomeo戰勝,克服表示“翻轉”oovercoato外套ooverlooko俯視;疏忽ooverbridgeo天橋ooverwhelmo壓倒;泛濫oiverrideo推翻,不理會ooverlapo重疊oovercrowdedooverproductiono生產過度ooverdoseo藥物過量o全能的ooveracto表演過火ooverworko過度勞累ooverstudyo用功過度?out-ooutlawo歹徒ooutbido出價多于ooutwito以機智取勝ooutwearo穿破ooutsizeo過大的ooutnumbero在數量上超過ooutliveooutdoo勝過,戰勝?omni-oomnisciento無所示在的oomnipotentoomnipresento無所不在的?non-ononconformisto不遵循傳統竽活的人ononstopo直達的冷漠的ononsmokingo不準吸煙的ononexistento不存在的?neo-oneoterico新近的;現代的oneologismo新詞oneophiliao喜新成癖oneolithico新石器時代的oneogamisto新婚者oneonatalo新生的,被生的?multi-omultitudeo多數;群眾omultimediaomishapo多媒體的omulticulturalo多種文化的omultiformo多種多樣的omultiplyo乘;繁殖omultipleo多樣的;多功能的omultidirectionalo多方向的omultilingualo多種語言的?mono-omonotonouso單調的omonopolyo壟斷omonologueo獨白omonogamyo一夫一妻制omonarcho君主，獨裁者?mis-omischievouso惡作劇的ominifyo壞運氣，不幸omiscreanto惡棍omisanthropeo憤世嫉俗者omistrusto不信任omisfortuneo不幸omisruleomisdoingo壞事omisunderstando誤解omisspello拼寫錯誤omistakeo錯誤?mini-odeminisho縮小的，減少的ominiono仆人ominimumo最小量ominimalo最低限度的ominiatureo小畫象，縮影ominiwaro小規模戰爭ominiskirto超短裙ominibuso小公共汽車?micro-omicrofilmo微縮膠卷omicrobiologyo微生物學omicrobeo微生物omicrowaveo微波omicroskirto超短裙omicroworldo微觀世界omicroscopeo顯微鏡?mal-omaladroito笨拙的omalevolento惡意的omalapropismo字的誤用omaltreato虐待omalodoro惡臭omalefactiono壞事，惡行omaledictiono詛咒omalnutritiono營養不良omalpracticeo不法行為omalcontento不滿的?homo-ohomogenizeo使一致ohomocentrico同中心的相同的方面治療ohomosexualo同性戀的ohomogeneouso同類的；同族的?macro-omacroclimateooooooooo?intro-oooooooooo?inter-ooooooo大氣候acrobian長壽的macroscale大規模的macrostructure宏觀結構macroworld宏觀世界introversible可向內翻的omit插入，干預vertntrospect內省，反省troduce引入，介紹interrelate相互關連nterlude休息interchangeable可互換的interactiono相互影響ointerveneo干涉ointersecto橫斷ointerposeo置于，介入ointerpersonalo人與人之間的ointernationalo國際的?im-,in-oindooro戶內的oinspiredo有靈感的oinflameo使燃燒；激怒oincorporateo合并，并入oincentiveo激勵oinaugurateo舉行就職典禮oinborno天生的oimpersonateo扮演，模仿oimplicitoimmutableo含蓄的oimpulseo沖動oimperilo處于危險中oimpelo驅動oimprisono監禁oinsubordinateo不服從的，反抗的表示“向內，進入”oinimitableo無可比擬的oinnocuouso無害的oindifferento冷漠的oinconstanto多變的，無常的oincorrigibleo積習難改的oinjusticeo不公正oinhumanoincapableo無能力的oingloriouso不光彩的o不變的oimmortalo不朽的oimpeccableo無瑕疵的oimpassiveo無動于衷的oimpartialo公平的oimpoliteo無禮的oimmoralo不道德的oimpossibleo不可能的?il-,ir-oirritateo激怒；刺激oirradiateo使明亮，生輝oirruptiono闖入，沖入oillusoryo虛幻的oillusiono幻覺oilluminateo照亮；使明白oillustrateo說明，闡明oirrevocableo不可取消的表示“使…成為，進入”oirresistibleo不可抗拒的oirrefutableo無可反駁的oirreproadchableo無可指責的oirresoluteo無決斷力的oirrelativeo無關的oirrationalo不合理的oirregularo不規則的oillimitableo無限的oillogicalo不合邏輯的oilliterateo不識字的oillegalo非法的?hypo-ohypotrophyo發育不良ohypomnesiao預料o記憶力減退ohypothesiso假說，假設ohypodermico皮下的?hyper-ohypertensiono過度緊張；高血壓ohyperboleo夸張法ohypercriticalo吹毛求疵的ohypersensitiveo過敏的ohyperactiveo活動過度的?hetero-oheterogeneouso異類的，不同的oheterodoxyo異教，異端oheterosexualo異性的?foe-oforeshadowo預示，暗示oforecastoforefathero前人，祖先oforebodeo預兆；兇兆oforestallo阻止?extra-oextravioleto紫外線的oextrapolateo推斷oextroverto性格外向的oextravaganto奢侈的oextraneouso外來的oextrasolaro太陽系以外的oextraordinaryo格外的oextracurriculumo課外的?exo-oexothermico放出熱量的oexoduso大批移出oexposeoexosphereo外大氣層?forearm?前人，祖先oexocentrico外向的，離心的oexoterico外界的，外面的oexotico來自異國的?ex-,ex-,ex-opresidento前任總統owifeo前妻oexpurgateoexhumeo掘出，挖出oexhaleo呼氣oexceedo超過，超出oexciseo切除oextracto抽出，拔出oexalto使升高o暴露oexpelo趕出，逐出oexcludeo排外?eu-oeugenicso優生學oeuphoriao幸福愉快感oeurhythmico協調的oeuphoniouso聲音優美的oeuphemismo委婉的詞語oeulogizeo贊美?epi-oepitomeo梗概，縮影oepisodeo一段經歷，片段oepilogueo后記，結尾部分oepigramo警句，格言oepidemico流行性的?em-,en-oenlighteno啟發，開導oencourageo鼓勵oendangero使危險oencompasso包圍，圍繞oenchanto使迷醉oenacto制定；頒布oemphrealo天空的oembosso使凸出oembellisho裝飾oembodyo體現oembittero使痛苦oempowero授權oenchainoencageo關入籠中?dys-oenrollo注冊，記入名冊oembattleo整軍備戰oembarrasso使難堪oempathyo感情相融的oembedo安置；嵌于oembraceo擁抱?e-,ef-oeffluenceo流出oeradicateo根除，滅絕oevadeo逃出，逃避oemergeo浮現oejecto投出，擲出oelaborateo精工細做的oelongateo延長，拉長odispelodystrophyo營養不良odyspepsiao消化不良?dis-odiscusso討論odiscardo丟棄，拋棄odisburseo支付，支出odismisso解散；開除odiscriminateo辨別；歧視odistendo膨脹odistracto分心odispenseo分配odisseminateo散布，傳播odismayodiscovero發現odispassionateo平心靜氣的?dia-o驅除，消除odisarmo解除武裝odiscourageo使失去勇氣odisproofo反證，反駁odisappearo消失odishonesto不誠實的odisordero無秩序odislikeo不喜歡?dif-odifformo不同形式的；不規則的odifficulto困難的odiffuseo散布的，散開的odiffidento自卑的odifferenceo不同odiffero不同odiagramo圖表odiagnosiso診斷odialectico辯證法odiaphanouso透明的；精致的odiametero直徑odialogueo對話?di-,n-,n-oalo婚姻的，結婚的omatrimonyo婚姻，結婚ometromatriarcho女族長；女家長omatero;omatro;opaternalismo家長式統治，家長作風母－oalo父親的，父系的opatenalounpatrioticopatriotismo愛國主義；愛國心ooticopatriotopatriarchalo家長的；族長的；家長似的opaterpatriarcho家長；族長oparto;opatro;odivorceo離婚父，祖－odivideo分開odigresso離題odiminisho減少；消失odigesto消化；文摘odiluteo沖淡，稀釋odilateo膨脹，擴大odichotomizeodilemmao進退兩難odioxideo二氧化物odichromatico兩色的?de-odefinitiono定義；清晰odesigno設計；計劃odepicto描繪odelimito劃定界限odefameodecodeo破譯odecelerateo減速odetraino下火車odepresso壓制，壓抑odevalueo降低價值odeforesto砍伐森林o沖突odesaltodestructiono破壞?counter-ocountermando撤消ocounterbalanceo平衡ocounteracto對抗；抵消?contra-ocontrabando走私ocontraveneo違反，違背ocontradicto反駁；矛盾ocontraryo相反的?com-,con-oconsoleo安慰ocongregateo集合的，聚集的oconfluenceo匯流oconflicto紀念oconsolidateo鞏固，加強ocondenseo凝結；濃縮oconfirmo堅定；證實oconcludeo結束；總結ocontemporaryo同時代的oconcentrico同中心的ocompresso壓縮ocomponento成分ocompeteo比賽ocommodiousocomforto安慰ocompacto緊密的；合同ocomparisono比較ocommensurableo相等的，相稱的ocommemorateo回避ocommendo贊揚；推薦ocompatrioto同胞ocompassiono同情ocombineo聯合，結合?col-ocor?co-ocoordinateo協調：同等的ocoincideo一致，符合，巧合ocohereo附著；粘著ocoexisto共存ocoalesceo聯合；合作ocoagulateo凝結ocooperationo合作?circum-ocircumventocircumspecto小心謹慎的ocircumscribeo限制ocircumnavigateo環航世界ocircumferenceo周長ocircumciseo環割?by-obyworko副業obypasso旁路；忽略obygoneo過時的obywayo小道obyroado輔路obyproducto副產品?bi-obiannualo一年兩次的obiennialo兩年一次的oooo?bene-oooooooooo?be-ooooooooooooal雙語種的kly雙周刊beneficent仁慈的，善行的benediction祝福好處，利益benefaction好事；恩惠benewolent好意的在下面在前面r小看降臨；發生欺騙obefriendo友好對待obewareo注意obesiegeo圍攻obequeatho遺留給，傳下obelieo掩蓋obeguileo欺騙?anti-oantibodyo抗體oantibacterialo抗菌的oantithesiso對立；反論oantipathyo反感oantiwaro反戰的?ante-oantecedentoooanterioro前面的oantedateo提前寫日期；先于，早于?ana-oanalysiso分析oanalogouso類似的oanalogyo類比；類似?an-oanonymouso匿名的oanechoico無回聲的oanharmonico不和諧的oanarchismo無政府主義?amphi-oamphicaro水陸兩用車oamphibiano兩棲動物?ad-oadvento來臨，來到oadmonisho告誡，警告oadventureo冒險oadjusto調整oadumbrateo預示oadmireo羨慕oadministrateo管理；執行oadjoino貼近；毗連oadjacento鄰近的oadhereo堅持oadopto收養；采納oadepto熟練的oadapto適應?ab-,ac-,ad-,af-,ag-,n-,ap-,ar-,as-,at-oaggravateo惡化oaggrandizeo擴大oaggressiono侵略，進攻oaffirmo肯定oaffordo買得起oaffableo親切的oadduceo引證，舉例oadditiveo上癮的oaddicto上癮，入迷oaccustomo使習慣oaccumulateo積累oaccomplisho強制oaccentuateo加速oaccelerateo陪伴?a-oawasho泛濫的oaliveo活的oaheado在前地oasideo在邊上oasleepo睡著的oanemiaoamoralo非道德性的不關政治的oasocialo不好社交的oacentrico無中心的?ab-,abs-oabstinenceo節制；禁欲oabsciseo切除oabscindo廢除oabscondo潛逃oabstaino戒絕oabstracto抽象的；心不在焉的oabjecto可憐的oabducto誘拐?twi-oabsento缺席的oabsorbo吸收oabuseo濫用oabnormalo反常的?with-owithholdo阻止第三部分通過詞根認識單詞owithdrawno隱退owithdrawo撤消，撤退?vice-,vice-,vice-omanagero副經理opresidento副總統?uni-ounisono和諧，協調ouniqueo獨一無二ouniformo一貫的，一致的o立體圖otwiformedo有兩種形式的otwilighto黎明，黃昏?tri-otripodo三腳架otripleo三倍的otricycleo三輪腳踏車otriangleo三角形?tetra-otetragono四角形otetracyclineo四環素?supra-,supra-osupramundaneo超現世的osupranatonalo超國家的oclasso超階級的?stereo-ostereoramoooo?step-oooooo?sex-oooo?septi-oooooooo?semi-oosterograph立體照片stereosonic立體聲的stepbrother異父兄弟stepdaughter前夫之女stepfather繼父foil六葉形sexangle六角形september九月septiateral七邊的septangle七角形semiautomatic半自動的?octa-osemicircleo半圓osemiconductoro半導體osemicolonyo半殖民地osemimonthlyo半月刊?quasi-,quasi-,quasi-ojudicialo準司法性的oofficialo半官方的?quadri-,quadru-oquadrilateralo四邊的oquadricycleo四輪車oquadrangleo四角形?penta-opentoxideo五氧化物opentagramo五角星形opentagono五角形；五角大樓ooctolateralo八邊的ooctobero十月ooctagono八角形?ob-oobsoleteo鈍的；愚蠢的oobsoleteo過時的oobscureo模糊的oobliviono忘卻，忘記oobliqueo傾斜的?milli-omillimetero毫米omillennialo一千年的?meta-ometapsyo超心理學，靈學ometaphysiso形而上學ometaphoro黨內的ooooo?kilo-oooooo?iso-oooooo?intra-ooooooo喻metamorphism變形；變性metabolism新陳代謝t千瓦eter公里gram公斤isomorphic形的nyotherm等溫線intranational國內的intrapersonal個人內心的intracollegiate大學內的traparty?holo-oholographyo全息攝影?hexa-ohexagono六角形?hepta-oheptagloto使用七種語言的oheptagono七角形?hemi-ohemicycleo半圓形ohemisphereo半球?hecto-ohectowatto一百瓦ohectogramo一百克?endo-oendocardialo心臟內的oendogenouso內生的，自生的?demi-,demi-oooooooo?deci-oooooo?deca-oooo?cata-ooooooofixed半固定的demirep名聲不好的女人demilune半月demigod半神半人decimate大量毀滅decigram十分之一克decimeter十分之一米decameter十米decagon十角形cataract大瀑布catastrophe災難，大禍catalogcataclysmo洪水；大災難?unper-ounderdevelopedo不發達的ounderpopulatedo人口稀少的ounderplayounderestimateo估計不足ounderwearo內衣表示“不足，不夠”ounderclothingo內衣褲ounderlingo下屬oundermineo破壞，損壞ounderseao在海底ounderlineounderwriteoundergroundo地下的?un-ounravelo非塵世的o解開；拆散ounbosomo吐露ouneartho從地下挖出ountombo掘墓oundresso脫衣服ouncovero揭開蓋子ounbuttono解開鈕扣ounbindo解開ounlocko開鎖ounchartedo圖上沒標明的表示“打開，解開，弄出”ounalloyedo未摻雜的oundecidedo未決定的ouncivilizedo未開化的ouneducatedo未受教育的ounworldlyounjusto非正義的ounofficialo非官方的ounfailingo無盡的，無窮的ounconscionableo無節制的ounambitiouso無野心的ounlimittedo無限的ounconditionalo無條件的ountowardo不幸的；逆境的ounscrupulouso肆無忌憚的ouncommittedo不承擔責任的ounassumingo不擺架子的ounabashedo不害臊的ounfortunateo不幸的ounequalo不平等的ounrealo不真實?ultra-,ultra-oultravioleto紫外線的oultraredo紅外線的oultramundaneo超俗的oultramoderno超現代化的oultrasonico超音速的oultraliberalo極端自由主義的表示“超出，超過”oreactionaryo極端反動的oultracleano極潔凈的oultramilitanto極端好戰的oultrapureo極純的?trans-otransmogrifyo變得古怪，變形otransitoryo短暫的otransfuseo輸血；充滿otransfigureo改觀；變形otranscribeo抄寫，轉錄otransactiono交易；辦理otranplanto移植otransecto橫切，橫斷表示“變換，改變，轉移”otransparento透明的otransmito傳送，傳播otransgresso冒犯；違背otranscendo超越，勝過otransnormalo超出常規的otranscontinetalo橫貫大陸的?sym-,syn-osyndromeo綜合癥狀osynopsiso摘要，概要osynthesiso合成osynonymo同義詞osynchronouso同時發生的osymposiumo專題討論會osymbiosiso共生osymmetryo對稱osymphonyo交響樂osympathyo同情?sus-osustenanceo生活資料，糧食osustaino支撐；承受osuspireo嘆息，渴望osuspenseo擔心；懸而不決osuspendo懸掛，中止osuspecto懷疑osusceptiveo有接受力的；敏感的osusceptibleo易受感染的，易受影響的?super-osupersedeo淘汰；取代osuperintendo監督osuperficialo膚淺的osuperimposeosuperstructureo上層建筑osuperviseo臨視osuperchargeo負載過重表示“在…上面”osupersensitiveo過度敏感的osuperciliouso目中無人的osuperfluouso多余的osupernaturalo超自然的osupersonico超音速的osupersizedo超大型的?sur-osurvivalo幸存，生存osurveillanceo臨視；看守osurchargeo附加費osurpluso多余的osurmounto登上，超越osurrealismo超現實主義osurpasso超過osurfaceo表面?suc-,suf-,sup-,sur-osurroundingo環境osurroundo包圍osurrogateo代替品；代理人osurreptitiouso鬼鬼崇崇的osupposeo猜想，推測osuppresso鎮壓，壓制osupporto支持osupplicateo懇求,乞求osupplicanto哀求的懇求的osupplanto排擠，取代osuffuseo彌漫，染遍osuffocateo窒息osuffixo后綴osuffero受苦osufficiento足夠的osuccumbo屈從；死亡osuccincto簡潔的，簡明的osucceedo成功?sub-osubarido附屬的o有點干燥的osubacido略酸的osubadulto接近成年的osubaratico近北極的osubcentralo接近中心的osubofficeo分辦事處表示“接近，靠近”osubeditoro助理編輯osubtitleo副標題osubtropicso亞熱帶osubcontinento次大陸osubterraneano地下的osubsideo下陷；平息osubscribeo捐獻，訂購osuborno收買，賄賂osubordinate?retro-osubmissiveo恭順的osubmergeo沉沒，淹沒osubliminalo潛意識的osubjugateo鎮壓；征服osubdueo征服；減輕?se-oselecto選出osevero切斷；脫離osegregateo隔離oseduceo勾引，誘惑oseditiono煽動叛亂osecreteo分泌；藏匿osecludeo和別人隔離；隱居osecedeo正式退出oretrovertoretrojecto向后投射oretroactiono倒行，反動oretrospecto回顧，回想oretrogresso倒退，退化oretrogrado后退，倒退?re-oreverberateo起回聲，反響oresurgenceo復興，再起oreiterateo重申oreinstateo重新恢復職位oreincarnateo化生，轉生oregenerateo改過自新的orefurbisho刷新；擦亮orecompenseo報酬；賠償orelinquishorecommendo贊揚；推薦oreclaimo取回,回收orecidivismo重新犯罪orecapitulateo重述；概括oreassureo消除某人疑慮orearrageo重新安排oreappearo再出現oresplendento輝湟的oresonanto回響的；洪亮的表示“一再，重新”orepugnanto