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| si·nus [ snəss ] (plural si·nus·es) |
noun |
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| Definition: |
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1. cavity in bone of skull: a cavity filled with air in the bones of the face and skull, especially one opening into the nasal passages
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2. channel for blood: a widened channel containing blood, especially venous blood
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3. channel leading from body cavity: an elongated tract leading from a pus-filled region of the body to the exterior or to the cavity of a hollow organ
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4. notch between leaves: a cleft or indentation between the lobes of a leaf or the fused petals of a corolla
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| [15th century < Latin, "curve, fold, hollow"] |
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