Hē'li-o-trōpe, n.

noun

n. [Fr. héliotrope, Lat. heliotropium, Gr. ἡλιοτρόπιον; ἥλιος, the sun, and τρέπειν, to turn, τρόπος, turn.]

(Anc. Astron.) An instrument or machine used by the ancients for showing when the sun arrived at the tropics and the equinoctial line.
(Bot.) A very fragrant plant of the genus Heliotropum, called also turnsole, or girasole. The most frequent species is H. peruvianum.
(Geodesy.) An instrument for making signals to an observer at a distance, by means of the sun's rays thrown off from a mirror.
(Min.) A variety of chalcedony, of a deep-green color, variegated with blood-red or yellowish spots.