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say it: ahs
os is a noun meaning "a mouth or mouthlike opening". It is pronounced /ˈɑs/ — ahs. It carries 5 recorded senses.
a mouth or mouthlike opening
a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
(computer science) software that controls the execution of computer programs and may provide various services
computer science
the left eye
rigid connective tissue that makes up the skeleton of vertebrates
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for os come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.