Webster's Revised Unabridged Dictionary · 1913

Whisker

Whisker , noun

1.
One who, or that which, whisks, or moves with a quick, sweeping motion.
2.
Formerly, the hair of the upper lip; a mustache; -- usually in the plural.
Hoary whiskers and a forky beard. — Pope
3.
That part of the beard which grows upon the sides of the face, or upon the chin, or upon both; as, side whiskers; chin whiskers.
4.
A hair of the beard.
5.
One of the long, projecting hairs growing at the sides of the mouth of a cat, or other animal.
6.
(Nautical) Iron rods extending on either side of the bowsprit, to spread, or guy out, the stays, etc.