Real Dictionary

teasel
countable noun: A teasel is a plant with dry prickly flowers and leaves.

teasel in American English
any of a genus (Dipsacus) of bristly plants of the teasel family, with prickly, cylindrical heads of yellowish or purplish flowers, esp. the fuller's teasel ( D. fullonum) with flower heads having sharp, spinelike bracts
designating a family (Dipsacaceae, order Dipsacales) of dicotyledonous plants bearing dense flower heads covered with stiff bracts, including scabiosa and teasel
to raise a nap on (cloth) by means of teasels
noun: any of several plants of the genus Dipsacus, having prickly leaves and flower heads
transitive verb: to raise a nap on (cloth) with teasels; dress by means of teasels

teasel in British English
noun: any of various stout biennial plants of the genus Dipsacus, of Eurasia and N Africa, having prickly leaves and prickly heads of yellow or purple flowers: family Dipsacaceae
verb: to tease (a fabric)