noun (used with a singular verb)
- Veterinary Pathology. a parasitic disease of poultry and other birds, characterized by frequent gaping due to infestation of the trachea and bronchi with gapeworms.
- a fit of yawning.
noun (functioning as singular)
- a disease of young domestic fowl, characterized by gaping or gasping for breath and caused by parasitic worms (gapeworms)
- informal a fit of yawning