1) Astronomical instrument
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https://www.crosswordclues.com/clue/triquetrum
[astronomy] The triquetrum (derived from the Latin tri- [`three`] and quetrum [`cornered`]) was the medieval name for an ancient astronomical instrument first described by Ptolemy (c. 90–c. 168) in the Almagest (V. 12). Also known as Parallactic Rulers, it was used for determining altitudes of heavenly bodies. Ptolemy calls it a `parallac...
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http://en.wikipedia.org/wiki/Triquetrum_(astronomy)
• (n.) One of the bones of the carpus; the cuneiform. See Cuneiform (b).
Found on
http://thinkexist.com/dictionary/meaning/triquetrum/
A bone in the wrist.
Found on
http://www.gadsbywicks.co.uk/uploaded/3822.pdf
(bone) Type: Term Definitions: 1. A bone on the medial (ulnar) side of the proximal row of the carpus, articulating with the lunate, pisiform, and hamate. Synonyms: triquetrum
Found on
http://www.medilexicon.com/medicaldictionary.php?t=11346
Type: Term Pronunciation: trī-kwē′trŭm, -kwet- Synonyms: triquetrum (bone), os triquetrum, cubital bone, os pyramidale, os triangulare, pyramidal bone, pyramidale, three-cornered bone
Found on
http://www.medilexicon.com/medicaldictionary.php?t=94062
The triquetrum is one of the eight carpal bones which constitute each wrist. This bone is so named because of its three-corner, or wedge-like, shape.
Found on
http://www.probertencyclopaedia.com/browse/ET.HTM
No exact match found.
