Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Three-sided, with sharp edges and concave sides.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Having three corners or sides; triangular.

Etymologies

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

[From Latin triquetrus, three-cornered : tri-, tri- + -quetrus, -cornered.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin triquetrus.

Examples

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