| opisthorchis | A genus of trematode liver flukes of the family opisthorchidae. It consists of the following species: o. Felineus, o. Noverca (amphimerus noverca), and o. Viverrini. The intermediate hosts are snails, fish, and amphibia. (12 Dec 1998) |
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| Opisthorchis sinensis | <radiology> Liver fluke, endemic to China, Japan, SE Asia, (?) cause of Oriental cholangitis, associated with cholangiocarcinoma !, bile duct is preferred site, snail reservoir leading to fresh water fish, XR: multiple stones in common bile duct (12 Dec 1998) |
| Opisthorchis viverrini | A species closely related to Opisthorchis felineus, very common in man in Thailand; causes opisthorchiasis. (05 Mar 2000) |
| opisthotic | <anatomy> The inferior and posterior of the three elements forming the periotic bone. Origin: Gr. Behind +, ear. Source: Websters Dictionary (01 Mar 1998) |
| opisthotonic | Relating to or characterised by opisthotonos. (05 Mar 2000) |
| opisthotonoid | Resembling opisthotonos. (05 Mar 2000) |
| opisthotonos | <neurology> A form of spasm in which the head and the heels are bent backward and the body bowed forward. Origin: Gr. Tonos = tension (18 Nov 1997) |
| opisthotonus | Spasm of the body where the head and heels are bent backward and the body is bowed forward. A type of extrapyramidal effect. (27 Sep 1997) |