the aquatic larva of a dobsonfly, used as bait in fishing.

1865–70, Americanism; origin uncertain

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World English Dictionary
hellgrammite (ˈhɛlɡrəˌmaɪt)
(US) Also called: dobson the larva of the dobsonfly, about 10 cm long with biting mouthparts: used as bait for bass
[C19: of unknown origin]

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Example sentences
Many anglers and bait shops incorrectly call this nymph a hellgrammite.
Most people know the aquatic larva, the hellgrammite, but rarely see the adults.
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