whiskers, a beard.

Usually, whiskers. side whiskers.

a single hair of the beard.

Archaic . a mustache.

one of the long, stiff, bristly hairs growing about the mouth of certain animals, as the cat or rat; vibrissa.

Also called whisker boom, whisker pole. Nautical . any spar for extending the clew or clews of a sail so that it can catch more wind.

Radio, Electronics . cat whisker.

Crystallography . a thin filament of a crystal, usually several millimeters long and one to two microns in diameter, having unusually great strength. ?

by a whisker

by the narrowest margin

She won the race by a whisker.

noun

beard , bristles , goatee , hair , mustache , sideburns , stubble