Dictionary
tour•ma•line
Pronunciation: (toor'mu-lin, -lēn"), [key]—
n.
any of a group of silicate minerals of complex composition, containing boron, aluminum, etc., usually black but having various colored, transparent varieties used as gems.
Also,tour•ma•linPronunciation: (toor'mu-lin), [key]turmaline.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.