barb
noun
°The point that stands backward in an arrow, fishhook, etc., to prevent it from being easily extracted. Hence: Anything which stands out with a sharp point obliquely or crosswise to something else.
°A beard, or that which resembles it, or grows in the place of it.
verb
°To furnish with barbs, or with that which will hold or hurt like barbs, as an arrow, fishhook, spear, etc.
°To cover a horse in armor, corrupted from bard.