词根词缀：onych-, onycho-, ony-, -onychia, -onychial, -onychium, -onyx-

【来源及含义】Greek: claw, nail; fingernails, toenails

【相关词根词缀】A cross reference, directly or indirectly, involving a word unit meaning "nail (finger, toe); claw": ungu-.

【同源单词】acronychous, acronyx, anonychia, anonychosis, Baryonyx Walkeri, dolichonychia

词根词缀：-onym, -onymy, -onymic, -onymically, -onymous, -onymously, -nym

【来源及含义】Greek: name; word

【相关词根词缀】Related "name" units: nom-; onomato-.
Related "word, words" units: etym-; legi-; lexico-; locu-; logo-; onomato-; verbo-.

【同源单词】acronym, acronym, acronymania, acronymic, acronymically, acronymous

词根词缀：oo-

【来源及含义】Greek: egg or eggs; used in an extended sense as the ovum

【同源单词】ooblast, oocenter, oocephalus, oocinesia, oocinesis, oocinete

词根词缀：oophoro-, oophor-

【来源及含义】Greek: ovary, egg [literally, "egg-carrier"; extended to mean ovary]

【同源单词】oophorectomize, oophorectomy, oophorites, oophoritis, oophorocystectomy, oophorocystosis

词根词缀：op-, opt-, optico-, opsi-, opso-, -opia, -ops, -opsia, -opsis, -opsy, -optic, -opic, -opy

【来源及含义】Greek: eye[s]; sight; see, vision

【相关词根词缀】 Related references to "eye" or "eye part" word families: blepharo-; core-; corneo-; eye, eyes; irido-; lenti-, lens-; lenticulo-; ocelli-; oculo-; ophthalmo-; phaco-; pupillo-; retino-; uveo-. Cross references of word families that are related directly, or indirectly, to: "appear, visible, visual, manifest, show, see, reveal, look": blep-; delo-; demonstra-; -orama; pare-; phanero-; phant-; pheno-; scopo-; spec-; vela-, veal-; video-, visuo-.

【同源单词】achromat, achromatopsia, acyanoblepsia, acyanopsia, aeluropsis, aglaucopsia

词根词缀：opaqu-

【来源及含义】Latin: not transparent nor translucent, not clear, unable to shine through; shaded, shady; dark; no luster; not clearly understood or expressed

【同源单词】electron opaque tracer, Isopaque, nonopaque, opacity, opaque projector, opaque

词根词缀：oper-

【来源及含义】Latin: to close, to enclose, to cover

【同源单词】cover, coverlet, covert, covert-feme, covertly, covertness

词根词缀：oper-, opus

【来源及含义】Latin: work

【相关词根词缀】 Cross references related to "work, toil" word families: argo-; ergasio-; ergo-; labor-; pono-; urg-.

【同源单词】co-operate, co-operation, co-operative, co-operativeness, ignioperation, inoperable

词根词缀：ophio-, ophi-, ophid-, -ophis; -ophidio, -ophidia

【来源及含义】Greek: snake, snakelike, serpent

【相关词根词缀】 A cross reference of other word family units that are related directly, or indirectly, with: "snakes or other reptiles": angui-; coluber-; herpeto-; reptil-; sauro-.

【同源单词】Carphophis, Hydrophid, Hydrophis, ophic, ophicalcite, Ophicephalidae

词根词缀：ophthalmo-, ophthalm-, -ophthalmia, -ophthalmic, -ophthalmos

【来源及含义】Greek: eye; sight

【相关词根词缀】 Related references to "eye" or "eye part" word families: blepharo-; core-; corneo-; eye, eyes; irido-; lenti-, lens-; lenticulo-; ocelli-; oculo-; op-, -optic; phaco-; pupillo-; retino-; uveo-.

【同源单词】anophthalmia, arteria ophthalmica, autoophthalmoscope, autoophthalmoscopy, binophthalmoscope, calyculus ophthalmicus