cos

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun ratio of the adjacent side to the hypotenuse of a right-angled triangle
noun lettuce with long dark-green leaves in a loosely packed elongated head
noun an odorless very poisonous gas that is a product of incomplete combustion of carbon

Clipping of cos lettuce, variously derived from the Greek island of Kos and from Arabic خس (ḵass, “lettuce”).

"The Countess of Jesmond, and the house-party at Coss have come to hear our Mamselle. — Fifty-Two Stories For Girls, Unknown

cosine

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