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Meaning of turnsole

turn•sole

Pronunciation: (tûrn'sōl"), [key]
— n.
  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.