Source : Webster's Revised Unabridged Dictionary (1913)

Teasel \Tea"sel\, v. t. [imp. & p. p. {Teaseled}or {Teaselled};
   p. pr. & vb. n. {Teaseling} or {Teaselling}.]
   To subject, as woolen cloth, to the action of teasels, or any
   substitute for them which has an effect to raise a nap.