Definition of turnsole
1 : any of several plants whose flowers or stems are supposed to follow the movement of the sun: a : heliotrope 1b b : sunflower c : sun spurge d : a double-flowered tulip (Tulipa suaveolens) of southern Russia
2 : a European annual herb (Chrozophora tinctoria) of the family Euphorbiaceae the juice of which is turned blue by ammonia
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