RhymeZone: turnsole definitions

Definitions of turnsole:

noun: A heliotrope; so named because its flowers are supposed to turn toward the sun.
noun: A sunflower.
noun: A sun spurge (Euphorbia helioscopia).
noun: The euphorbiaceous plant Chrozophora tinctoria.
noun: A purple dye obtained from Chrozophora tinctoria.
noun: (chemistry, obsolete) litmus

(Definitions from Wiktionary)