Sinuses
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. [1913 Webster]

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. [1913 Webster]

4. (Med.) A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice. [1913 Webster]

5. (Bot.) A depression between adjoining lobes. [1913 Webster]

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}. (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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • sinuses — si·nus || saɪnÉ™s n. (Anatomy) any of several hollow cavities or passages in the body; one of the hollow cavities in the skull that connects to the nasal passages …   English contemporary dictionary

  • sinuses of dura mater — sinus durae matris [TA] large venous channels forming an anastomosing system between the layers of the cranial dura mater. They are devoid of valves, do not collapse when drained, and in some parts contain trabeculae. They drain the cerebral… …   Medical dictionary

  • Paranasal sinuses — Paranasal sinuses. Lateral projection of the paranasal sinus …   Wikipedia

  • Dural venous sinuses — Vein: Dural venous sinuses Dural veins …   Wikipedia

  • Transverse sinuses — Infobox Vein Name = PAGENAME Latin = sinus transversus durae matris GraySubject = 171 GrayPage = 657 Caption = Dural veins. (Transverse sinuses labeled as SIN. TRANS. at center right. Caption2 = The transverse sinuses are formed by the tentorium… …   Wikipedia

  • Confluence of sinuses — Vein: Confluence of sinuses Dural veins. (Labeled with confluens sinuum ) …   Wikipedia

  • Intercavernous sinuses — Infobox Vein Name = Intercavernous sinuses Latin = sini intercavernosi GraySubject = 171 GrayPage = 659 Caption = Dural veins Caption2 = The sinuses at the base of the skull. (Visible as light blue circle at center.) DrainsFrom = DrainsTo =… …   Wikipedia

  • paranasal sinuses — the air filled spaces, lined with mucous membrane, within some of the bones of the skull. They open into the nasal cavity, via the meatuses, and are named according to the bone in which they are situated. They comprise the frontal sinuses and the …   Medical dictionary

  • Sphenoidal sinuses — Infobox Bone Name = Sphenoidal sinuses Latin = sinus sphenoidalis GraySubject = 223 GrayPage = 998 Caption = Lateral wall of nasal cavity; the three nasal conchæ have been removed. (Sphenoidal sinus visible at upper right, in dark circle.)… …   Wikipedia

  • paranasal sinuses — the air filled spaces, lined with mucous membrane, within some of the bones of the skull. They open into the nasal cavity, via the meatuses, and are named according to the bone in which they are situated. They comprise the frontal sinuses and the …   The new mediacal dictionary

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