• Webster's Revised Unabridged Dictionary
    • Turnsole (Bot) A kind of spurge (Euphorbia Helioscopia).
    • Turnsole (Bot) A plant of the genus Heliotropium; heliotrope; -- so named because its flowers are supposed to turn toward the sun.
    • Turnsole (Chem) A purple dye obtained from the plant turnsole. See def. 1 .
    • Turnsole (Chem) Litmus.
    • Turnsole (Bot) The euphorbiaceous plant Chrozophora tinctoria.
    • Turnsole (Bot) The sunflower.
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Chambers's Twentieth Century Dictionary
    • n Turnsole turn′sōl a name sometimes given to the Heliotrope and other plants, esp. to the euphorbiaceous Chrozophora tinctoria, from which a deep-purple dye is obtained.
    • ***


Webster's Revised Unabridged Dictionary
F. tournesol, It. tornasole,; tornare, to turn (LL. tornare,) + sole, the sun, L. sol,. See Turn Solar (a.), and cf. Heliotrope
Chambers's Twentieth Century Dictionary
Fr.,—tournersol, for soleil—L. sol, the sun.


In literature:

Some you may colour with saffron, turnsole, or green wheat, and blew-bottles for blew.
"The accomplisht cook" by Robert May