词根词缀：di-, dicho-, dich-

【来源及含义】Greek: number two; twice, divided, double; unalike; a number used as a prefix

【同源单词】diacanthous, diacid, diadelphous, dianthous, diarch, diarchy

词根词缀：diplo-, dipl-

【来源及含义】Greek: double [two-fold]

【同源单词】diplobacillus, diplobacteria, diplobacterium, diploblastic, diplocardia, diplocardiac

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