A barb or sharp point of an arrow or other instrument,
projecting backward to prevent the head from being easily drawn out.

That part of the under side of a horse’s lower jaw which is
above the chin, and bears the curb of a bridle.

The byssus of certain shellfish, as the muscle.

Long or stiff hairs on a plant; the awn; as, the beard of
grain.

The gills of some bivalves, as the oyster.

The appendages to the jaw in some Cetacea, and to the mouth
or jaws of some fishes.

The long hairs about the face in animals, as in the goat.

The hair that grows on the chin, lips, and adjacent parts of
the human face, chiefly of male adults.

The cluster of small feathers at the base of the beak in
some birds

In insects, the hairs of the labial palpi of moths and
butterflies.