hirschsprung's disease
- n congenital condition in which the colon does not have the normal network of nerves; there is little urge to defecate so the feces accumulate and cause megacolon
hirudinea
- n hermaphroditic aquatic or terrestrial or parasitic annelids
hirudinean
- n carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end
hirudo medicinalis
- n large European freshwater leech formerly used for bloodletting
hirundo nigricans
- n of Australia and Polynesia; nests in tree cavities
hirundo pyrrhonota
- n North American swallow that lives in colonies and builds bottle-shaped mud nests on cliffs and walls
hirundo rustica
- n common swallow of North America and Europe that nests in barns etc.