| COOPTIONS | • cooptions n. Plural of cooption. • co-options n. Plural of co-option. • COOPTION n. the act of coopting, also COOPTATION. |
| HOROPITOS | • HOROPITO n. (Maori) a bushy New Zealand shrub, with red aromatic peppery leaves. |
| NOTORIOUS | • notorious adj. Senses with an unfavourable connotation. • notorious adj. Senses with a favourable or neutral connotation. • notorious adv. (Obsolete) Synonym of notoriously. |
| OCOTILLOS | • ocotillos n. Plural of ocotillo. • OCOTILLO n. (Nahuatl) a cactus-like Mexican tree. |
| ODONTOIDS | • odontoids n. Plural of odontoid. • ODONTOID n. a toothlike projection from the second vertebra of the neck. |
| OOLOGISTS | • oologists n. Plural of oologist. • oölogists n. Plural of oölogist. • OOLOGIST n. an expert in oology. |
| ORATORIOS | • oratorios n. Plural of oratorio. • ORATORIO n. (Italian) a choral work usually on a scriptural subject. |
| OROLOGIST | • orologist n. (Obsolete, rare) One versed in orology. • OROLOGIST n. one versed in orology, the study of mountains, also OREOLOGIST. |
| ORRISROOT | • orrisroot n. The root of the orris. • ORRISROOT n. the root of orris, used in perfumery. |
| OTOLOGIES | • otologies n. Plural of otology. • OTOLOGY n. the science of the ear. |
| OTOLOGIST | • otologist n. A doctor specializing in otology. • OTOLOGIST n. a practitioner of otology, the study of the ear. |
| OTOSCOPIC | • otoscopic adj. Relating to otoscopy or otoscopes. • OTOSCOPIC adj. relating to otoscopy, the examination of the ear. |
| TOKOLOSHI | • TOKOLOSHI n. (Zulu) in Bantu folklore, a hairy malevolent dwarflike creature with supernatural powers, also TIKOLOSHE, TOKOLOSHE. |
| VOODOOIST | • voodooist n. A practitioner or student of voodoo. • VOODOOIST n. a practitioner of voodoo. |
| ZOOLOGIST | • zoologist n. One who studies zoology. • zoölogist n. Alternative spelling of zoologist. • ZOOLOGIST n. one who studies zoology. |
| ZOONOMIST | • zoonomist n. One who studies zoonomy. • ZOONOMIST n. an animal physiologist. |
| ZOOTOMIES | • zootomies n. Plural of zootomy. • ZOOTOMY n. the dissection of animals. |
| ZOOTOMIST | • zootomist n. One who carries out zootomies. • zoötomist n. Alternative form of zootomist. • ZOOTOMIST n. one who dissects animals, or is skilled in zootomy. |
| ZOOTOXINS | • zootoxins n. Plural of zootoxin. • ZOOTOXIN n. a toxin produced by an animal. |