sinus

(nəs)

noun

  1. a bend or curve
  2. any cavity or hollow formed by a bending or curving
  3. Anat., Zool. any of various cavities, hollows, or passages; esp.,
    1. any of the air cavities in the skull opening into the nasal cavities
    2. a large channel for venous blood
    3. a dilated part in a blood vessel, etc.
  4. Bot. a rounded depression between two consecutive lobes, as of a leaf
  5. Med. a channel leading from a pus-filled cavity

Origin: L, a bend, curve, fold

See sinus in American Heritage Dictionary 4

noun
  1. A depression or cavity formed by a bending or curving.
  2. Anatomy
    a. A dilated channel or receptacle containing chiefly venous blood.
    b. Any of various air-filled cavities in the bones of the skull, especially one communicating with the nostrils.
  3. Pathology A fistula leading from a pus-filled cavity.
  4. Botany A recess or indentation between lobes of a leaf or corolla.

Origin:

Origin: Middle English, hollow in the body

Origin: , from Medieval Latin

Origin: , from Latin, curve, hollow

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