Definition of hornworm in US English:

hornworm

noun

North American
  • The caterpillar of a hawk moth, having a spike or “horn” on its tail.

    Family Sphingidae: several genera and many species, in particular pests like the tobacco hornworm (Manduca sexta) and the tomato hornworm (M. quinquemaculata)

    • ‘Aphids, whiteflies, hornworms, and even field mice are more visible and more easily controlled when you don't have to battle them in a tangle of ground-hugging vines.’
    • ‘Parasitic wasps can be released to help control the hornworm.’
    • ‘Adult hornworms are huge grayish brown moths with wingspans of up to five inches.’
    • ‘While some members of the Berytidae family are beneficial and prey on crop pests such as aphids, mites, cotton budworm, and tomato hornworm, others are serious pests of tomato, cotton, and cacao.’
    • ‘Protect your plants from damage caused by frost, wind, pests (aphids, hornworms, potato beetles, slugs, and snails), diseases (Fusarium wilt, early blight), animals, hungry or mischievous kids, and jealous neighbors.’

Pronunciation

hornworm

/ˈhôrnwərm/