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Webster 1913 Edition

Noun.

[L.

exaestuatio

A boiling up; effervescence.

[Obs.]

Boyle.

Noun.

[L. exoestuatio; ex and oestuo, to boil.]

A boiling; ebullition; agitation caused by heat; effervescence.

exestuation ‎(uncountable)

(obsolete) A boiling up; effervescence.
(Can we find and add a quotation of Boyle to this entry?)