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sinus
(sī′nəs)
noun
- a bend or curve
- any cavity or hollow formed by a bending or curving
- Anat., Zool. any of various cavities, hollows, or passages; esp.,
- any of the air cavities in the skull opening into the nasal cavities
- a large channel for venous blood
- a dilated part in a blood vessel, etc.
- Bot. a rounded depression between two consecutive lobes, as of a leaf
- Med. a channel leading from a pus-filled cavity
Origin: L, a bend, curve, fold
See sinus in American Heritage Dictionary 4
noun
- A depression or cavity formed by a bending or curving.
- 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.
- Pathology A fistula leading from a pus-filled cavity.
- 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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