hornet(redirected from Vespa (genus))
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Any of various large stinging wasps of the family Vespidae, chiefly of the genera Vespa and Vespula, that characteristically build large papery nests.
members of the genus Vespula of wasps in the order Hymenoptera. Hornet venom contains histamine, serotonin, acetylcholine, hyaluronidase and phospholipase.