Any worm or worm-like larva that lives in or feeds on grass, particularly certain caterpillars and beetle larvae.
Compound of Old English 'græs' (grass) and 'worm' (worm, serpent, creeping creature). This straightforward descriptive compound dates back to agricultural and naturalist writings.
Grassworms like armyworms can devastate crops in days, and farmers have tracked these creatures for thousands of years—they're mentioned in Egyptian records and Biblical plagues, making them one of humanity's oldest recognized pests.
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