Definition of bloodworm
1 : any of various reddish annelid worms (as of genera Glycera or Tubifex) often used as bait
2 : any of several strongyle worms (genus Strongylus) that are parasitic in the large intestine of horses
First Known Use of bloodworm
Medical 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
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