This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. a symbol of the trigonometric function cosine.

abbreviation. cosine

conjunction. because

n. a symbol of the trigonometric function cosine.

n. A variety of lettuce with long, crisp leaves.

n. See coss.

n. An abbreviation of cosine.

n. A kind of lettuce, suited for being grown out of doors in summer, usually forming long heads or rosettes.

n. ratio of the adjacent side to the hypotenuse of a right-angled triangle

n. lettuce with long dark-green leaves in a loosely packed elongated head

"You know for example, that: sin (4x) = 2sin (2x) cos (2x) sin (2x) = 2sin (x) cos (x) cos (2x) = cos² (x) - sin² (x), etc ..."

trigonometric function    circular function    lettuce   

Wikipedia article on Cos    Wikipedia article on cosine   

Cross    Ross    across    boss    coss    criss-cross    cross    dos    doss    dross