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turnsole n. 燈臺草科植物,天芥菜屬的植物 燈台草科植物,天芥菜屬的植物 Turnsole \Turn"sole`\, n. [F. tournesol, It. tornasole; tornare
to turn (LL. tornare) sole the sun, L. sol. See {Turn}, {Solar}, a., and cf. {Heliotrope}.] [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}. [1913 Webster] 2. (Chem.) (a) Litmus. [Obs.] (b) A purple dye obtained from the plant turnsole. See def. 1 (d) . [1913 Webster] Heliotrope \He"li*o*trope\, n. [F. h['e]liotrope, L. heliotropium, Gr. ?; ? the sun ? to turn, ? turn. See {Heliacal}, {Trope}.] 1. (Anc. Astron.) An instrument or machine for showing when the sun arrived at the tropics and equinoctial line. [1913 Webster] 2. (Bot.) A plant of the genus {Heliotropium}; -- called also {turnsole} and {girasole}. {Heliotropium Peruvianum} is the commonly cultivated species with fragrant flowers. [1913 Webster] 3. (Geodesy & Signal Service) An instrument for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror. [1913 Webster] 4. (Min.) See {Bloodstone} (a) . [1913 Webster] {Heliotrope purple}, a grayish purple color. [1913 Webster]
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