[hell.gram.mite] n [origin unknown] (1866): a carnivorous aquatic No. American insect larva that is the young form of a dobsonfly (esp. Corydalis cornutus) and is used for fish bait
HELLGRAMMITE
Meaning of HELLGRAMMITE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012