Definitions

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

  • adjective Rhombohedral.

from The Century Dictionary.

  • Pertaining to a trigon; having the form of a trigon; triangular.
  • In entomology, triangular in cross-section; having three long edges; trihedral; prismatic: as, trigonal antennæ; trigonal joints.
  • In botany, same as trigonous.
  • In anatomy, noting a triangular space at the base of the bladder. See trigonum .
  • noun In anatomy, the triangular space at the base of the bladder; the trigonum.

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

  • adjective Having three angles, or corners; triangular.

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

  • adjective symmetrically triangular

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective having threefold symmetry

Etymologies

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

[Earlier, relating to a trigon or triplicity, relating to three angles : Latin trigōnum, triangle; see trigon + -al.]

Examples

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