Cos

2.	Mathematics. (of a real or complex number x) the function cos x defined by the infinite series 1 − (x²/2!) + (x⁴/4!) − + …, where ! denotes factorial. Abbreviation: cos Compare sine (def. 3), factorial (def. 1).

Origin:
1625–35; < NL cosinus. See co-, sine¹

Kos

[kos, kaws]

–noun

one of the Greek Dodecanese Islands in the SE Aegean Sea, off the SW coast of Turkey. 16,650; 111 sq. mi. (287 sq. km).

Also, Cos.

Italian, Coo.

ro⋅maine

[roh-meyn, ruh-]

–noun

Also called romaine lettuce, cos, cos lettuce. a variety of lettuce, Lactuca sativa longifolia, having a cylindrical head of long, relatively loose leaves.

Origin:
1905–10; < F, fem. of romain Roman

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To Cos

cos¹ (kôs, kŏs)

n. See romaine.

[After Cos (Kos).]

cos²
abbr. cosine

Cos (kŏs, kôs)

See Kos.

co·sine (kō'sīn')

(click for larger image in new window)
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.

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.

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.]

Word Origin & History

kos

measure of distance in India (about 2 miles), from Hindi kos, from Skt. krosah, lit. "a call, a shout;" thus, "distance within which a man's shout can be heard."

romaine

1907, from Fr. romaine (in laitue romaine, lit. "Roman lettuce"), from fem. of O.Fr. romain "Roman," from L. Romanus "Roman." Perhaps so called because of the lettuce's introduction into France (by Bureau de la Rivière, chamberlain of Charles V and VI) at the time of the Avignon papacy (1309-77).

Science Dictionary

cos
Abbreviation of cosine

cosine (kō'sīn') Pronunciation Key

The ratio of the length of the side adjacent to an acute angle of a right triangle to the length of the hypotenuse.
The abscissa of 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.
A function of a number x, equal to the cosine of an angle whose measure in radians is equal to x.

Computing Dictionary

COS
1. Cray Operating System.
2. Corporation for Open Systems.

Abbreviations & Acronyms

cos
cosine

COS
Colorado Springs Airport

Encyclopedia

Cos

island off the southwestern coast of Turkey, the third largest of the Dodecanese Islands, Greece.

Learn more about Cos with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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