The word hornet is one of the oldest insect names in the English language, traceable through Old English hyrnet to Proto-Germanic *hurznuta and thence to a Proto-Indo-European root *ḱr̥h₂s-n- that demonstrates the word's remarkable antiquity. The PIE form is reconstructed from cognates across multiple branches of the language family, including Latin crābrō (hornet), Old Church Slavonic sršenĭ, Czech sršeň, Russian шершень (shershen), and Lithuanian šìršė.
The deeper etymology of the PIE hornet word is debated. One prominent theory connects it to the PIE root *ḱerh₂-, meaning horn or head, suggesting the insect was named for its prominent horn-like antennae or perhaps for the buzzing drone it produces (horns being ancient instruments of sound). The connection between hornet and horn is reflected in the apparent folk-etymological influence visible in several Germanic forms, where the word has been reshaped to look more like horn. The English form hornet, with its initial h and its -orn- sequence,
Hornets belong to the genus Vespa within the family Vespidae, and they are distinguished from other wasps by their larger size, more powerful sting, and colonial social structure. The European hornet (Vespa crabro) is the only species native to Europe and was the hornet known to English speakers throughout most of history. This insect, which can reach over an inch in length, builds large paper nests from chewed wood fiber and can deliver a painful sting, though it is generally less aggressive than commonly believed.
The cultural significance of hornets is reflected in numerous idioms and expressions. To stir up a hornet's nest means to provoke a furious and potentially dangerous response — an image based on the genuine hazard of disturbing a hornet colony, whose members will defend their nest with coordinated aggression. Unlike honeybees, which lose their stingers and die after a single sting, hornets can sting repeatedly, making an angered colony a formidable threat.
The hornet has served as a symbol of military ferocity. The USS Hornet has been the name of nine United States Navy vessels, including the aircraft carrier from which the Doolittle Raid was launched in 1942. The name was also applied to the de Havilland Hornet fighter aircraft and the AMC Hornet automobile, each trading on connotations of speed, aggression, and danger.
The arrival of the Asian giant hornet (Vespa mandarinia) in the Pacific Northwest of North America in 2019, sensationally dubbed the "murder hornet" by media, generated widespread public alarm and renewed interest in hornet biology. These insects, the largest hornets in the world, are known for their ability to destroy entire honeybee colonies, making their potential establishment in North America a serious ecological concern.