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A Writer's Dictionary:

sinuses Definition


Dictionary Home » Words Starting with S » sinker ... six and half a dozen » sinuses


sinus
noun sinuses
    1. anatomy.
      A cavity or depression filled with air, especially in the bones of mammals.
    2. anatomy.
      A cavity filled with blood, especially in the brain and certain blood vessels.
    3. bot.
      A notch or depression between two lobes in a leaf.
Etymology: 16c: Latin, meaning ‘curve'.



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