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sinus
[ sahy-nuhs ]
/ ˈsaɪ nəs /
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noun, plural si·nus·es.
a curve; bend.
a curving part or recess.
Anatomy.
- any of various cavities, recesses, or passages, as a hollow in a bone, or a reservoir or channel for venous blood.
- one of the hollow cavities in the skull connecting with the nasal cavities.
- an expanded area in a canal or tube.
Pathology. a narrow passage leading to an abscess or the like.
Botany. a small, rounded depression between two projecting lobes, as of a leaf.
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Origin of sinus
1590–1600; <Latin sinus (stem sinu-) bent or curved surface, curve, fold
OTHER WORDS FROM sinus
si·nus·like, adjectiveWords nearby sinus
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use sinus in a sentence
British Dictionary definitions for sinus
sinus
/ (ˈsaɪnəs) /
noun plural -nuses
anatomy
- any bodily cavity or hollow space
- a large channel for venous blood, esp between the brain and the skull
- any of the air cavities in the cranial bones
pathol a passage leading to a cavity containing pus
botany a small rounded notch between two lobes of a leaf, petal, etc
an irregularly shaped cavity
Word Origin for sinus
C16: from Latin: a curve, bay
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for sinus
sinus
[ sī′nəs ]
A cavity or hollow space in a bone of the skull, especially one that connects with the nose.
A channel for the passage of a body fluid, such as blood.
The American Heritage® Science Dictionary
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