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.