barb

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barb

(bärb)
n.
1. A sharp point projecting in reverse direction to the main point of a weapon or tool, as on an arrow or fishhook.
2. Zoology A small, sharp point projecting in reverse direction from the tip, as on a porcupine quill or a bee sting.
3. Zoology One of the parallel filaments projecting from the main shaft of a feather.
4. Botany A short, sharp, reflexed bristle or hairlike projection.
5. See barbel1.