the larva of any of several hawk moths, having a hornlike process at the rear of the abdomen.

1670–80, Americanism; horn + worm

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If the tobacco hornworm looks odd from the outside as it crawls, check out the inside.
When hornworm caterpillars eat tobacco plants, they doom themselves with their own spit.
Although many people think a hornworm can sting with its horn, this is not true.
These predators will eat pesky insects such as aphids and tomato hornworm.
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