Small blood cavity in organ tissue

• Tiny endothelium-lined passages for blood in the tissue of an organ
• The curve of y=sin x

Wiktionary Word definitions in Wiktionary
a. 1 (context mathematics English) sinusoidal. 2 (context anatomy English) Characteristic of a sinus. n. 1 (context mathematics English) A sine curve. 2 (context anatomy English) Any of several channels through which venous blood passes in various organs. ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1823 in mathematics; 1900 in physiology, from sinus + -oid . Related: Sinusoidal .

WordNet Word definitions in WordNet
n. tiny endothelium-lined passages for blood in the tissue of an organ the curve of y=sin x [syn: sine curve ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sinusoid \Si"nus*oid\, n. [Sinus + -oid.] (Geom.) The curve whose ordinates are proportional to the sines of the abscissas, the equation of the curve being y = a sin x. It is also called the curve of sines .

Wikipedia Word definitions in Wikipedia
A sinusoid is a small blood vessel that is a type of capillary similar to a fenestrated endothelium . Sinusoids are actually classified as a type of open pore capillary (or discontinuous) as opposed to continuous and fenestrated types. Fenestrated capillaries ...