cos

ro·maine

(rō-mān')

n. A cultivar of lettuce (Lactuca sativa) having a slender head of oblong or obovate leaves with broad midribs. Also called cos¹, cos lettuce.

[French, from feminine of Romain, Roman, from Old French, from Latin Rōmānus, from Rōma, Rome.]

Kos also Cos

(kŏs, kôs)

An island of southeast Greece in the northern Dodecanese Islands at the entrance to the Gulf of Kos, an inlet of the Aegean Sea on the southwest coast of Turkey. Hippocrates founded a medical school on the island in the fifth century B.C. Kos became part of modern Greece in 1947.

co·sine

(kō'sīn')

n. Abbr. cos

In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse.
The abscissa at the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point (1, 0) if x is positive or clockwise if x is negative.

Cos Audio Help (kŏs, kôs)

See Kos.

cos²
abbr. cosine

cos¹ Audio Help (kôs, kŏs)

n. See romaine.

[After Cos (Kos).]

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The American Heritage® Dictionary of the English Language, Fourth Edition
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