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From: Webster's Revised Unabridged Dictionary (1913)

 Turn·sole n.  [Written also turnsol.]
 1. Bot. (a) A plant of the genus Heliotropium; heliotrope; -- so named because its flowers are supposed to turn toward the sun. (b) The sunflower. (c) A kind of spurge (Euphorbia Helioscopia). (d) The euphorbiaceous plant Chrozophora tinctoria.
 2. Chem. (a) Litmus. [Obs.] (b) A purple dye obtained from the plant turnsole. See def. 1 (d).
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