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