1. turnsole - Noun
2. turnsole - Adjective
A plant of the genus Heliotropium; heliotrope; -- so named because its flowers are supposed to turn toward the sun.
The sunflower.
A kind of spurge (Euphorbia Helioscopia).
Litmus.
A purple dye obtained from the plant turnsole. See def. 1 (d).
Source: Webster's dictionary