Tea"sel (?), n. [OE. tesel, AS. t&?;sel, t&?;sl, the fuller's herb. See
Tease.] [Written also tassel, tazel, teasle, teazel, and teazle.] 1.
(Bot.) A plant of the genus Dipsacus, of which one species (D.
fullonum) bears a large flower head covered with stiff, prickly, hooked
bracts. This flower head, when dried, is used for raising a nap on
woolen cloth.
Small teasel is Dipsacus pilosus, wild teasel is D. sylvestris.