bloodworm

blood·worm

noun \ˈbləd-ˌwərm\

Definition of BLOODWORM

: any of several comparatively large bloodsucking nematode worms of the genus Strongylus that are parasitic in the large intestine of horses and have larvae which wander in the viscera and sometimes lodge in the intestinal blood vessels causing colic or more rarely a fatal aneurysm—called also palisade worm, red worm