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The Collaborative International Dictionary
Dephlegmator

Dephlegmator \De*phleg"ma*tor\, n. An instrument or apparatus in which water is separated by evaporation or distillation; the part of a distilling apparatus in which the separation of the vapors is effected.

Wiktionary
dephlegmator

n. (context chemistry archaic English) An instrument or apparatus in which water is separated by evaporation or distillation; the part of a distilling apparatus in which the separation of the vapours is effected.