Dictionary
trac•trix
Pronunciation: (trak'triks), [key]—
n.,
—pl. trac•tri•cesPronunciation: (trak-trī'sēz, trak'tru-sēz"). [key]
Geom.
a curve whose tangents are all of equal length; the involute of a catenary.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.