1. the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals; [syn: trapezium, trapezium bone, os trapezium]
WordNet (r) 3.0 (2006):
os trapezium
n 1: the wrist bone on the thumb side of the hand that
articulates with the 1st and 2nd metacarpals [syn:
trapezium, trapezium bone, os trapezium]