sinus

sinus

1. Anatomy

a. any bodily cavity or hollow space

b. a large channel for venous blood, esp between the brain and the skull

c. any of the air cavities in the cranial bones

2. Pathol a passage leading to a cavity containing pus

3. Botany a small rounded notch between two lobes of a leaf, petal, etc.

4. an irregularly shaped cavity

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

sinus

(sÿ -nŭs) A semienclosed break along the borders of a lunar mare or in a scarp. The word is used in the approved name of such a feature on the Moon. (Latin: bay)

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

sinus

[′sī·nəs]

(biology)

A cavity, recess, or depression in an organ, tissue, or other part of an animal body.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Sinus

 

in anatomy, a cavity, protrusion, or long closed channel. In vertebrates (including man), the term “sinus” refers to a channel filled with venous blood in the dura mater. The cavity in some cranial bones is also called a sinus. [23–1297–]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.