noun
- tiny branches that extend from the barbs of a feather, helping to hold the barbs together
Usage: biology; ornithology
Examples
- The barbules on bird feathers have tiny hooks that zip the feather together.
- Under a microscope, you can see the intricate structure of barbules.
- Damaged barbules can make a feather look disheveled and fluffy.
- The barbules interlock to create the smooth surface of a flight feather.
- Scientists study barbules to understand how feathers maintain their aerodynamic properties.
- Oil helps keep the barbules properly aligned during preening.