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bone, os | rigid connective tissue that makes up the skeleton of vertebrates | |
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oculus sinister, OS | the left eye | |
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OS, operating system | [in computer_science] software that controls the execution of computer programs and may provide various services | |
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os | a mouth or mouthlike opening | |
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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 |