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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: botany) A plant of the genus Heliotropium; heliotrope; so named because its flowers are supposed to turn toward the sun. The sunflower.

A kind of spurge (euphorbia Helioscopia).

The euphorbiaceous plant Chrozophora tinctoria.

2. (Science: chemistry) litmus. A purple dye obtained from the plant turnsole. See def. 1 .

Origin: F. Tournesol, It. Tornasole; tornare to turn (LL. Tornare) _ sole the sun, L. Sol. See Turn, Solar, and cf. Heliotrope

Alternative forms: turnsol.