Heliotrope /(?)/

He·li·o·trope

Heliotrope

n.
  1. An instrument or machine for showing when the sun arrived at the tropics and equinoctial line. (Anc. Astron.)
  2. A plant of the genus Heliotropium; -- called also turnsole and girasole. Heliotropium Peruvianum is the commonly cultivated species with fragrant flowers. (Bot.)
  3. An instrument for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror. (Geodesy & Signal Service)
  4. See Bloodstone (a). (Min.)

Phrases & Compounds
Heliotrope purple
a grayish purple color.