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

  • n. A quadrilateral having two parallel sides.
  • n. A small bone in the wrist, situated near the base of the index finger.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A (convex) quadrilateral with two (non-adjacent) parallel sides.
  • n. The trapezoid bone of the wrist.
  • n. A convex quadrilateral with no sides parallel and no equal sides.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having the form of a trapezoid; trapezoidal.
  • adj. Of or pertaining to the trapezoid ligament.
  • n. A plane four-sided figure, having two sides parallel to each other.
  • n. A bone of the carpus at the base of the second metacarpal, or index finger.

from The Century Dictionary and Cyclopedia

  • Having the shape of a trapezoid. See II., 1.
  • n. In geometry, a plane four-sided figure having two of its opposite sides parallel, and the other two not so.
  • n. In anatomy and zoology, the trapezoid bone, one of the bones of the wrist, so called from its shape; the second one of the distal row of carpal bones, on the radial or thumb side, between the trapezium and the magnum, in special relation with the head of the second metacarpal bone; carpale II. of the typical carpus. Also called multangulum minus, and trapezoides, trapezoideum. See cuts under Artiodactyla, pisiform, hand, and scapholunar.
  • n. In anthropology, a type of cranium with somewhat flattened vertex and basal region which are approximately in parallel planes.

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

  • n. a quadrilateral with two parallel sides
  • n. the wrist bone between the trapezium and the capitate bones


New Latin trapezoīdēs, from Greek trapezoeidēs, trapezium-shaped : trapeza, table; see trapezium + -oeidēs, -oid.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek τραπέζιον ("irregular quadrilateral", literally "a little table") + -oid ("resembling"). (Wiktionary)



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