bloodworm Syllabification: (blood·worm)Pronunciation: /ˈblədwərm/Definition of bloodworm noun 1the bright red aquatic larva of a nonbiting midge, the blood of which contains hemoglobin that allows it to live in poorly oxygenated water. Genus Chironomus, family Chironomidae 2another term for tubifex.bloodworm in other Oxford dictionaries Definition of bloodworm in the British & World English dictionary