| three-cornered | 1. Having three corners, or angles; as, a three-cornered hat. 2. <botany> Having three prominent longitudinal angles; as, a three-cornered stem. Source: Websters Dictionary (01 Mar 1998) |
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| three-cornered bone | A bone on the medial (ulnar) side of the proximal row of the carpus, articulating with the lunate, pisiform, and hamate. Synonym: os triquetrum, cubital bone, os pyramidale, os triangulare, pyramidal bone, pyramidale, three-cornered bone, triquetrum. (05 Mar 2000) |