- any of several plants regarded as turning with the movement of the sun.
- heliotrope (def. 2).
- a European plant, Chrozophora tinctoria, of the spurge family, yielding a purple dye.
- the purple dye prepared from this plant; litmus.
- any of various plants having flowers that are said to turn towards the sun
- a euphorbiaceous plant, Croton tinctoria, of the Mediterranean region that yields a purple dye
- the dye extracted from this plant
