| Word | Definitions | Synonyms |
|---|---|---|
| arccos | (noun) the inverse function of the cosine; the angle that has a cosine equal to a given number | Synonyms: arc cosine, arccosine, inverse cosine |
| cos | (noun) lettuce with long dark-green leaves in a loosely packed elongated head | Synonyms: cos lettuce, romaine, romaine lettuce |
| (noun) ratio of the adjacent side to the hypotenuse of a right-angled triangle | Synonyms: cosine |