Pronunciation: (tûrn'sōl"), [key]
1. any of several plants regarded as turning with the movement of the sun.
2. heliotrope (def. 2).
3. a European plant, Chrozophora tinctoria, of the spurge family, yielding a purple dye.
4. the purple dye prepared from this plant; litmus.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.