Source : Webster's Revised Unabridged Dictionary (1913)

Flagellate \Flag"el*late\, v. t. [imp. & p. p. {Flagellated}; p.
   pr. & vb. n. {Flagellating}.] [L. flagellatus, p. p. of
   flagellare to scoure, fr. flagellum whip, dim. of flagrum
   whip, scoure; cf. fligere to strike. Cf. {Flall}.]
   To whip; to scourge; to flog.