Definition of whisker
1 a
:a hair of the beard
b
whiskers plural
(2)
:the part of the beard growing on the sides of the face or on the chin
c
:hairbreadth
- lost the race by a whisker
2
:one of the long projecting hairs or bristles growing near the mouth of an animal (such as a cat or bird)
3
:an outrigger extending on each side of the bowsprit to spread the jib and flying jib guys
—usually used in plural
4 a
:a shred or filament resembling a whisker
b
:a thin hairlike crystal (as of sapphire or copper) of exceptional mechanical strength used especially to reinforce composite structural material
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