whisker

The hair on a man's cheeks and chin.

A single hair of a beard or mustache.

One of the long stiff tactile bristles or hairs that grow near the mouth and elsewhere on the head of most mammals; a vibrissa.

A narrow margin; a hairsbreadth.

One of two spars or booms projecting from the side of a bowsprit for spreading the jib or flying-jib guys.