ophthalm (o) - [GK] = eye 眼

ophthalmology n. 眼科学 [-logy = the science of] 

ophthalmoscope n. [医]检目镜 [-scope = a device for viewing]

ophthalmotomy n. [医]眼球切开术 [-tomy= cutting] 

oro- [GK]= mountain 山

orogeny n. [地]造山运动 [-geny = the act of producing]

orography n. [地] 山志学 [-graphy = the science of]

orometer n. 山岳气压计 [- meter = a measuring device] 

ortho- [GK] = straight 直的；correct 正确的 

orthogonal a. 互相垂直的，直角的[gon= angle] orthograde a. (走路姿势）身体笔直的 [grad = to step] 

orthodox a. 正统的；传统的 [dox= opinion]

orthography n. 正字法 [-graphy = writing] 

osteo- [GK] = bone 骨 

osteology n. [解]骨学 [-logy = the science of]

osteomalacia n. 软骨病  [-malacia = softness]

osteopathy n. 疗骨术 [-pathy = treatment] 

oto- [GK] = ear 耳 

otology n. 耳科学 [-logy = the science of]

otophone n. 助听器 [-phone = a device for better sound]

otoscope n. [医]耳镜 [-scope = a device for viewing] 

ovi- [L] = egg 卵 

oviduct n. [解]输卵管[duct = to lead] 

oviparous a. [生]卵生的 [-parous = producing] 

oviposit n. [生](昆虫)产卵[posit =to place] 

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