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