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The Collaborative International Dictionary
Exestuate

Exestuate \Ex*es"tu*ate\, v. i. [L. exaestuatus,p. p. of exaestuare to boil up. See Estuate.] To be agitated; to boil up; to effervesce. [Obs.]

Wiktionary
exestuate

vb. (context obsolete rare English) To be agitated; to boil up; to effervesce.