1
a
: an Old World prickly herb (Dipsacus fullonum of the family Caprifoliaceae, the honeysuckle family) with flower heads that are covered with stiff hooked bracts and were used especially formerly in the woolen industry
called also fuller's teasel
b
: a plant of the same genus as the teasel
2
a
: a flower head of the fuller's teasel used when dried to raise a nap on woolen cloth
b
: a wire substitute for the teasel
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Merriam-Webster unabridged
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