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Douglas Harper's Etymology Dictionary
quadratus

"square-shaped muscle," 1727, from Latin quadratus "square, squared" (see quadratic).

Wiktionary
quadratus

n. (context anatomy English) Any of several skeletal muscles more or less quadrangular in outline.

Wikipedia
Quadratus

Quadratus is Latin for square. Quadratus was also a cognomen from the Roman Republic and Roman Empire. It may refer to:

Quadratus (martyr)

In addition to Quadratus of Athens (Quadratus the Apologist), there are several Christian saints with the name Quadratus (sometimes spelled Codratus):

Usage examples of "quadratus".

I can hardly imagine that Quadratus was hoping to make a Christian of me, he assuredly strove to convince me of the excellence of his doctrine, and to prove, above all, that it offered no harm to the State.

Gaius Volusenus Quadratus, a military tribune senior enough for a prefecture, be seconded to duty with him over the winter.

Shortly after this, Commius encountered Gaius Volusenus Quadratus for the second time.

When brought face to face with a pair of bewitchingly pretty lips, he steadied himself against disaster by looking straight through to the exact spot where the quadratus labii superiosis separated into three muscular controls employed in the enchanting act of smiling.