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The Collaborative International Dictionary
Dephlegm

Dephlegm \De*phlegm"\, v. t. [Pref. de- + phlegm water; cf. F. d['e]phlegmer, d['e]flegmer.] (O. Chem.) To rid of phlegm or water; to dephlegmate. [Obs.]
--Boyle.

Wiktionary
dephlegm

vb. (context obsolete chemistry English) To rid of phlegm or water; to dephlegmate.