The Collaborative International Dictionary
Debellate
Debellate \De*bel"late\, v. t. [L. debellatus, p. p. of
debellare to subdue; de- + bellum war.]
To subdue; to conquer in war. [Obs.]
--Speed.
Wiktionary
debellate
vb. (context obsolete transitive English) To subdue; to conquer in war.