Source : Webster's Revised Unabridged Dictionary (1913)

Ventouse \Ven"touse\, n. [F.]
   A cupping glass. [Obs.] --Chaucer.

Ventouse \Ven"touse\, v. t. & i.
   To cup; to use a cupping glass. [Obs.] [Written also
   {ventuse}.] --Chaucer.