Turnsole

Part of speech: noun (n.)

1. A plant of the genus Heliotropium; heliotrope; -- so named because its flowers are supposed to turn toward the sun.

2. The sunflower.

3. A kind of spurge (Euphorbia Helioscopia).

4. The euphorbiaceous plant Chrozophora tinctoria.

5. Litmus. [Obs.]

6. A purple dye obtained from the plant turnsole. See def. 1 (d).