- (in Euclidean geometry) any rectilinear quadrilateral plane figure not a parallelogram.
- a quadrilateral plane figure of which no two sides are parallel.
- British.trapezoid(def 1a).
- Anatomy. a bone in the wrist that articulates with the metacarpal bone of the thumb.
Origin of trapezium
- mainly British a quadrilateral having two parallel sides of unequal lengthUsual US and Canadian name: trapezoid
- mainly US and Canadian a quadrilateral having neither pair of sides parallel
- a small bone of the wrist near the base of the thumb
Word Origin and History for trapezial
1560s, from Late Latin trapezium, from Greek trapezion "irregular quadrilateral," literally "a little table," diminutive of trapeza "table," from tra- "four" (see four) + peza "foot, edge," related to pous (see foot (n.)). Before 1540s, Latin editions of Euclid used the Arabic word helmariphe. As the name of a bone in the wrist, it is recorded from 1840.
- Relating to a trapezium or to the trapezius muscle.
- A quadrilateral having no parallel sides.
- A bone in the wrist at the base of the thumb, articulating with the first and second metacarpal, scaphoid, and trapezoid bones.
- A four-sided plane figure having no parallel sides.