Sinus

3 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Sinus \Si"nus\, n.; pl. L. {Sinus}, E. {Sinuses}. [L., a bent
     surface, a curve, the folds or bosom of a garment, etc., a
     bay. Cf. {Sine}, n.]
     1. An opening; a hollow; a bending.
        [1913 Webster]
  


     2. A bay of the sea; a recess in the shore.
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     3. (Anat. & Zool.) A cavity; a depression. Specifically:
        (a) A cavity in a bone or other part, either closed or
            with a narrow opening.
        (b) A dilated vessel or canal.
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     4. (Med.) A narrow, elongated cavity, in which pus is
        collected; an elongated abscess with only a small orifice.
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     5. (Bot.) A depression between adjoining lobes.
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     Note: A sinus may be rounded, as in the leaf of the white
           oak, or acute, as in that of the red maple.
           [1913 Webster]
  
     {Pallial sinus}. (Zool.) See under {Pallial}.
  
     {Sinus venosus}. [L., venous dilatation.] (Anat.)
        (a) The main part of the cavity of the right auricle of
            the heart in the higher vertebrates.
        (b) In the lower vertebrates, a distinct chamber of the
            heart formed by the union of the large systematic
            veins and opening into the auricle.
            [1913 Webster]

From WordNet (r) 2.0 [wn]:

  sinus
       n 1: an abnormal passage leading from a suppurating cavity to the
            body surface [syn: {fistula}]
       2: any of various air-filled cavities especially in the bones
          of the skull
       3: a wide channel containing blood; does not have the coating
          of an ordinary blood vessel [syn: {venous sinus}]

From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:

  48 Moby Thesaurus words for "sinus":
     alveolation, alveolus, antrum, arc, armpit, basin, bow, bowl,
     catacaustic, catenary, caustic, cavity, circle, concave, concavity,
     conchoid, crater, crook, crypt, cup, curl, curve, depression,
     diacaustic, dip, ellipse, festoon, fold, follicle, funnel chest,
     hole, hollow, hollow shell, hook, hyperbola, lacuna, lituus,
     parabola, pit, pocket, punch bowl, scoop, shell, sink, socket,
     tracery, trough, vug