trapezoid
/ˈtɹæpəzɔɪd/ noun
Forms trapezoids
- noun (geometry, US, Canada) A (convex) quadrilateral with two (non-adjacent) parallel sides.
- noun (geometry, UK, Australia, New Zealand) A convex quadrilateral with no sides parallel.
- noun (anatomy) The trapezoid bone of the wrist.
- noun (ice hockey) The marked trapezoidal area immediately behind the goal line and the goal itself within which the goaltender may touch the puck.
Synonyms
trapezium irregular quadrilateral trapezoid bone os trapezoideum
Etymology
Learned borrowing from New Latin trapezoïdēs. By surface analysis, trapeze + -oid. First attested in 1704.
Webster’s 1913
- noun A plane four-sided figure, having two sides parallel to each other.
- noun A bone of the carpus at the base of the second metacarpal, or index finger.
- adjective Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.
- adjective Of or pertaining to the trapezoid ligament; as, the trapezoid line.
Etymology [Gr. trapézoïde. See Trapezium.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “trapezoid”, CC BY-SA 4.0. Details