〔Robert von Ostertag，德国兽医，1864～1940〕胃线虫属：毛圆线虫科(Trichostrongylus)寄生性弱毒线虫的一个属，主要见于牛和其他反刍动物皱胃胃壁中的囊内- onomatology
- onomatomania
- onomatophobia
- onomatopoiesis
- ontogenesis
- ontogenetic
- ontogenic
- ontogeny
- onyalai, onyalia
- onych-
- onychatrophia
- onychatrophy
- onychauxis
- onychectomy
- onychia
- onychitis
- onychoclasis
- onychocryptosis
- onychodystrophy
- onychogenic
- onychogram
- onychograph
- onychogryphosis
- onychogryposis
- onychoheterotopia