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Meaning of SINUS

Pronunciation:  'sInus

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

SINUS is a 5 letter word that starts with S.


 Synonyms: fistula, venous sinus
 See Also: bodily cavity, canal, cavernous sinus, cavity, cavum, channel, coronary sinus, duct, epithelial duct, ethmoid sinus, ethmoidal sinus, frontal sinus, maxillary sinus, nasal sinus, paranasal sinus, passage, passageway, sigmoid sinus, sinus cavernosus, sinus coronarius, sinus ethmoidales, sinus paranasales, sinus rectus, sinus sigmoideus, sinus transversus, straight sinus, tentorial sinus, transverse sinus



Webster's 1913 Dictionary
\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.

2. A bay of the sea; a recess in the shore.

3. (Anat. & Zo["o]l.) 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.

4. (Med.) A narrow, elongated cavity, in which pus is
   collected; an elongated abscess with only a small orifice.

5. (Bot.) A depression between adjoining lobes.

Note: A sinus may be rounded, as in the leaf of the white
      oak, or acute, as in that of the red maple.

{Pallial sinus}. (Zo["o]l.) 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.

Medical Dictionary
 Definition: air cavities within the facial bones, lined by mucous membranes similar to those in other parts of the airways.
Biology Dictionary
 Definition: A notch, depression or cavity on the surface of an organ.