Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Three-edged; having three salient angles: triquetrous mandibles.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having three corners or sides; triangular.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Three sided, the sides being plane or concave; having three salient angles or edges; trigonal.

from The Century Dictionary and Cyclopedia

  • Three-sided; triangular; having three plane or concave sides

Etymologies

From Latin triquetrus, three-cornered : tri-, tri- + -quetrus, -cornered.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin triquetrus. (Wiktionary)

Examples

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