triquetrum

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tri·que·trum

 (trī-kwē′trəm, -kwĕt′rəm)
n. pl. tri·que·tra (-kwē′trə, -kwĕt′rə)
A bone of the wrist in the proximal row of carpal bones.

[Latin, neuter of triquetrus, three-cornered; see triquetrous.]

tri·que′tral (-trəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

triquetrum

(traɪˈkwiːtrəm)
n
1. (Anatomy) anatomy a wrist bone. Also called: triquetral bone
2. (Astronomy) an ancient astronomical instrument used to determine the altitude of heavenly bodies
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014