n. Any of several channels through which venous blood passes in various organs.
adj. sinusoidal.
adj. That resembles a sinus.
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. The curve of sines, in which the abscissas are proportional to an angle, and the ordinates to its sine.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. tiny endothelium-lined passages for blood in the tissue of an organ
n. the curve of y=sin x
Word Usage
"The reason that the sinusoid is optional is that sometimes without the sinusoid, the estimated lines end up with a wavy component."