sinus

Definitions of sinus
  1. noun
    any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities
  2. noun
    any of various air-filled cavities especially in the bones of the skull
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    type of:
    cavité
    (anatomy) a natural hollow or sinus within the body
  3. noun
    ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
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    type of:
    fonction trigonométrique
    function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
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