triquetrum : Idioms & Phrases
allium triquetrum
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noun European leek naturalized in Great Britain; leaves are triangular
three-cornered leek; triquetrous leek.
WordNet
os triquetrum
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noun a wrist bone that articulates with the pisiform and hamate and lunate bones
triquetral; triquetral bone; cuneiform bone; pyramidal bone.