01 n. An instrument or machine for showing when the sun arrived at the tropics and equinoctial line.
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1.
An instrument or machine for showing when the sun arrived at the tropics and equinoctial line.(Anc. Astron.)
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2.
A plant of the genus Heliotropium; -- called also turnsole and girasole. Heliotropium Peruvianum is the commonly cultivated species with fragrant flowers.(Bot.) Also: turnsole, girasole
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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)
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Phrases & compounds
Heliotrope purple —
a grayish purple color.