The Collaborative International Dictionary
Excoct
Excoct \Ex*coct"\v. t. [L. excoctus, p. p. of excoquere to
excoct. See 3d Cook.]
To boil out; to produce by boiling. [Obs.]
--Bacon.
Wiktionary
excoct
vb. (context transitive English) To extract a material by boiling