Barbicel

noun

1. One of the minute, hooked projections extending from and interlocking the barbules of a feather.
2. In ornithology, a fringing process of the third order of a feather; a fringe of a barbule; one of the processes with which a barbule is fringed, differing from a hamulus or hooklet in not being recurved.
3. One of the small hooklike processes on the barbules of feathers.
4. Any of the hooks on the barbules of a feather that interlock adjacent barbs