from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A depression or cavity formed by a bending or curving.
- n. Anatomy A dilated channel or receptacle containing chiefly venous blood.
- n. Anatomy Any of various air-filled cavities in the bones of the skull, especially one communicating with the nostrils.
- n. Pathology A fistula leading from a pus-filled cavity.
- n. Botany A recess or indentation between lobes of a leaf or corolla.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A pouch or cavity in any organ or tissue, especially the paranasal sinus.
- n. An abnormal cavity or passage such as a fistula, caused by the destruction of tissue.
from the GNU version of the Collaborative International Dictionary of English
- n. An opening; a hollow; a bending.
- n. A bay of the sea; a recess in the shore.
- n. A cavity; a depression.
- n. A cavity in a bone or other part, either closed or with a narrow opening.
- n. A dilated vessel or canal.
- n. A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice.
- n. A depression between adjoining lobes.
from The Century Dictionary and Cyclopedia
- n. A bend or fold; a curving part of anything; a sinuosity; specifically, a bay of the sea; a gulf.
- n. In anatomy and zoology, a cavity or hollow of bone or other tissue, in the widest sense; a bay, recess, pocket, dilatation, or excavation, generally deeper and less open than a fossa: used with either English or Latin context.
- n. In pathology, a narrow passage leading to an abscess or other diseased locality; a fistula.
- n. In botany, the recess or rounded curve between two projecting lobes: as, the sinuses of a repand or sinuate leaf. See cuts under kidney-shaped, pinnatifid, repand, and sinuate.
- n. The bony air-sinuses of the head. See def. 2 .
- n. The rhombocœlia. Also called sinus rhomboidalis.
- n. one of the sinuses of the dura mater (see above), or
- n. a sinus venosus (see above).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an abnormal passage leading from a suppurating cavity to the body surface
- n. any of various air-filled cavities especially in the bones of the skull
- n. a wide channel containing blood; does not have the coating of an ordinary blood vessel
Middle English, hollow in the body, from Medieval Latin, from Latin, curve, hollow.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin sinus. (Wiktionary)