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  • Webster's Revised Unabridged Dictionary
    • n Triquetrum (Anat) One of the bones of the carpus; the cuneiform. See Cuneiform.
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Century Dictionary and Cyclopedia
    • n triquetrum An 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.
    • n triquetrum In 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.
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Chambers's Twentieth Century Dictionary
    • n Triquetrum one of the triangular Wormian bones in the lambdoid suture of the skull
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Webster's Revised Unabridged Dictionary
Chambers's Twentieth Century Dictionary
L. tres, three, -quetrus, prob. a mere formative.