Trapezia

Part of speech: noun

Definitions

1. A plural form referring to distinct triangular or quadrilateral shapes resembling trapezoids in geometry ; a group of muscles located between the neck and shoulder blades responsible for moving and stabilizing the shoulder ; multiple anatomical regions or formations characterized by short, sharp projections or structures in certain animals or plants
2. Several instances of four-sided figures with only one pair of parallel sides in mathematics ; a set of symmetrical muscles extending across the upper back supporting arm and head movement ; numerous small, flat or angular body parts or spiny projections seen in various biological contexts
3. Various geometrical figures with a single pair of parallel sides occurring in plural ; multiple broad flat muscles spanning the upper back for posture and arm elevation ; plural anatomical components or segments shaped or named for their trapezoidal contours in nature or zoology

Etymology: The geometric sense of this word began with a table. Ancient Greek "trápeza" meant "table", and the diminutive "trapezion" meant "small table", which Greek geometers applied to an irregular four-sided figure, the kind of shape you might sketch on a small board. The Late Latin "trapezium" carried that Greek term into the learned vocabulary of mathematics. English adopted the word as a learned borrowing, and its first recorded appearance dates to 1570. It is a doublet of "trapeze", the swinging bar, which descends from the same Greek word for "table" through a different route into the language. The plural "trapezia" simply keeps the Latin plural ending, which English writers have used for words borrowed in this form. The anatomical senses, the muscle group and the bone formations, were named later by taking the same geometric term and applying it to shapes of similar outline.

Synonyms: trapezium, wrist bone