noun
- A disease of birds, especially poultry, caused by a parasitic worm that obstructs the respiratory tract and causes the bird to gape for breath.
Usage: veterinary; chiefly historical or regional
Examples
- The farmer noticed several chickens suffering from gapeseed and called the veterinarian.
- Gapeseed was once a common problem in poultry farms before modern parasite control.
- The bird's constant gaping was a telltale sign of gapeseed infection.