trapezium
/tɹæˈpi.zi.əm/ noun
Forms trapeziums trapezia
- noun (geometry, UK, Australia, New Zealand) A quadrilateral with two sides parallel.
- noun (restrictively) A quadrilateral with two sides parallel and two sides non-parallel.
- noun (geometry, US, dated) A four-sided polygon with no parallel sides and no sides equal; a simple convex irregular quadrilateral.
- noun (anatomy) The trapezium bone of the wrist.
- noun A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibers.
Synonyms
trapezoid irregular quadrilateral trapeze trapezium bone os trapezium
Antonyms
Etymology
Learned borrowing from Late Latin trapezium, borrowed from Ancient Greek τρᾰπέζῐον (trăpézĭon, “irregular quadrilateral”, literally “small table”), from τράπεζα (trápeza, “table”) + -ιον (-ion, diminutive suffix). First attested in 1570. Doublet of trapeze.
Webster’s 1913
- noun A plane figure bounded by four right lines, of which no two are parallel.
- noun (a) A bone of the carpus at the base of the first metacarpal, or thumb.
Etymology [NL., fr. Gr. Tetra-) + Foot.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “trapezium”, CC BY-SA 4.0. Details