SINUSOID
sinusoid
(noun) tiny endothelium-lined passages for blood in the tissue of an organ
Source: WordNet® 3.1
Etymology
Noun
sinusoid (plural sinusoids)
(mathematics) A curve having the shape of a sine wave.
(anatomy) Any of several channels through which venous blood passes in various organs.
Adjective
sinusoid (comparative more sinusoid, superlative most sinusoid)
(mathematics) sinusoidal.
(anatomy) Characteristic of a sinus.
Source: Wiktionary
Si"nus*oid, n. Etym: [Sinus + -oid.] (Geom.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition