nTriquetrum(Anat) One of the bones of the carpus; the cuneiform. See Cuneiform.
Century Dictionary and Cyclopedia
ntriquetrumAn instrument used by ancient and medieval astronomers for measuring altitudes of heavenly bodies; the parallactic rules of Ptolemy. It consisted of three rods: one vertical, the second jointed to it at the top and carrying sights, the third jointed to the first at the bottom. The second and third were graduated.
ntriquetrumIn anatomy, one of the irregular, often triangular, Wormian bones found in the lambdoid suture of the skull: more fully called os triquetrum, and generally in the plural ossa triquetra.
Chambers's Twentieth Century Dictionary
nTriquetrumone of the triangular Wormian bones in the lambdoid suture of the skull