redwormPronunciation: /ˈrɛdwəːm/Definition of redworm noun 1a red earthworm used in composting kitchen waste and as fishing bait. Lumbricus rubellus, family Lumbricidae 2a parasitic nematode worm occurring in the intestines of horses. Genus Strongylus, class Phasmida redworm in other Oxford dictionaries Definition of redworm in the US English dictionary