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From: Webster's Revised Unabridged Dictionary (1913)

 He·li·o·trope n.
 1. Anc. Astron. An instrument or machine for showing when the sun arrived at the tropics and equinoctial line.
 2. Bot. A plant of the genus Heliotropium; -- called also turnsole and girasole.  Heliotropium Peruvianum is the commonly cultivated species with fragrant flowers.
 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.
 4. Min. See Bloodstone (a).
 Heliotrope purple, a grayish purple color.
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