| omphalos | <anatomy> The navel. Origin: L, fr. Gr. Source: Websters Dictionary (01 Mar 1998) |
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| omphalosite | Underdeveloped twin of allantoidangiopagous twin; joined by umbilical vessels. Synonym: placental parasitic twin. Origin: omphalo-+ G. Sitos, food (05 Mar 2000) |
| omphalospinous | Denoting a line connecting the umbilicus and the anterior superior spine of the ilium, on which lies McBurney's point. (05 Mar 2000) |
| omphalotomy | <surgery> The operation of dividing the navel-string. Origin: Gr.; the navel + to cut: cf. F. Omphalotomie. Source: Websters Dictionary (01 Mar 1998) |
| omphalotripsy | Crushing, instead of cutting, the umbilical cord after childbirth. Origin: omphalo-+ G. Tripsis, a rubbing (05 Mar 2000) |
| omphalovesical | <anatomy, urology> Relating to the urinary bladder and the umbilicus. Synonym: omphalovesical. (05 Mar 2000) |
| omphalus | Rarely used term for umbilicus. Origin: G. Omphalos, navel (05 Mar 2000) |
| OMS | Organisation Mondiale de la Sant'. The World health organisation (who). (12 Dec 1998) |
| Omsk haemorrhagic fever | A form of epidemic haemorrhagic fever found in central Russia, caused by the Omsk haemorrhagic fever virus, a member of the family Flaviviridae, and transmitted by Dermacentor ticks; associated with gastrointestinal symptoms and haemorrhages but little or no central nervous system involvement. (05 Mar 2000) |
| Omsk haemorrhagic fever virus | A virus of the genus Flavivirus causing Omsk haemorrhagic fever. (05 Mar 2000) |