| 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) |