Definition of heliotrope

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