WordNet (r) 3.0 (2006):
cos n 1: ratio of the adjacent side to the hypotenuse of a right- angled triangle [syn: cosine, cos] 2: lettuce with long dark-green leaves in a loosely packed elongated head [syn: cos, cos lettuce, romaine, romaine lettuce]The Free On-line Dictionary of Computing (19 January 2023):
COS 1. Cray Operating System. 2. Corporation for Open Systems.