turn sole

turnsole

[turn-sohl]
noun
1.
any of several plants regarded as turning with the movement of the sun.
2.
heliotrope ( def 2 ).
3.
a European plant, Chrozophora tinctoria, of the spurge family, yielding a purple dye.
4.
the purple dye prepared from this plant; litmus.

Origin:
1325–75; Middle English turnesole < Middle French tournesol the dye < Italian tornasole the plant, literally, (it) turns (toward the) sun, on the model of Greek hēliotrópion heliotrope

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World English Dictionary
turnsole (ˈtɜːnˌsəʊl)
 
n
1.  any of various plants having flowers that are said to turn towards the sun
2.  a euphorbiaceous plant, Croton tinctoria, of the Mediterranean region that yields a purple dye
3.  the dye extracted from this plant
 
[C14: from Old French tournesole, from Old Italian tornasole, from tornare to turn + sole sun, from Latin sōl sun]

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