A plant of the genus Dipsacus
, of which one species (Dipsacus 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. [1913 Webster
" Small teasel is Dipsacus pilosus, wild teasel is Dipsacus sylvestris."