Quadratus

Part of speech: noun

Pronunciation: /kwɒˈdreɪ.təs/

Definitions

1. A four-sided geometric figure often associated with the concept of squares in mathematical contexts
2. A Latin term meaning "square," referring to shapes or structures that possess equal sides and angles
3. An anatomical term describing a muscle or structure that is squared in form, such as certain muscles in the body

Etymology: Latin "quadratus" was the past participle of "quadrare," meaning "to make square," so its basic sense was simply "squared" or "made into a square." The adjective was used in Latin for anything shaped like a square, and in anatomy the muscle takes its name from that shape. Some muscles are named for their silhouette, and this one is a flat, roughly four-cornered sheet, so the Latin descriptor transferred directly. The word's sense of "square" is what makes it useful as a label. Its close relative "quadrate," which also came through Latin, has been used in English for square-shaped things since the same root was adopted into the language. Anatomists took the adjective and made it the proper name for a muscle, so a term that began as a carpenter's or geometer's description ended up in medical textbooks.