Sinusoid

from WordNet (r) 3.0 (2006)

sinusoid
    n 1: tiny endothelium-lined passages for blood in the tissue of
         an organ
    2: the curve of y=sin x [syn: {sine curve}, {sinusoid}]

from The Collaborative International Dictionary of English v.0.48

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}.
   [1913 Webster]