Available Definitions:
1) a. - A plant of the genus Heliotropium; heliotrope; -- so named because its flowers are supposed to turn toward the sun.
2) a. - The sunflower.
3) a. - A kind of spurge (Euphorbia Helioscopia).
4) a. - The euphorbiaceous plant Chrozophora tinctoria.
5) a. - Litmus.
6) a. - A purple dye obtained from the plant turnsole. See def . 1 (d).