Os - Definition

n 1: a mouth or mouthlike opening
2: a hard brittle blue-grey or blue-black metallic element that
is one of the platinum metals; the heaviest metal known [syn:
osmium, Os, atomic number 76]
3: (computer science) software that controls the execution of
computer programs and may provide various services [syn:
operating system, OS]
4: the left eye [syn: oculus sinister, OS]
5: rigid connective tissue that makes up the skeleton of
vertebrates [syn: bone, os]