Entry 1 sense Webster, 1913 Triquetrum · Tri·que·trum · IPA 01 n. One of the bones of the carpus; the cuneiform. See Cuneiform (b). pl. Triquetra ((#)) 1. One of the bones of the carpus; the cuneiform. See Cuneiform (b).(Anat.) See: Cuneiform