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| os·ti·um [ óstee əm ] (plural os·ti·a [ óstee ə ]) |
noun |
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| Definition: |
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1. small opening: a small pore or opening in a passage or organ of the body
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2. pore in sponge: a pore or small opening in a sponge, through which water passes
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| [Mid-17th century. < Latin, "mouth of a river, opening"] |
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