Definition of earthworm
: a terrestrial annelid worm (class Oligochaeta)
especially
: any of a family (Lumbricidae) of numerous widely distributed hermaphroditic worms that move through the soil by means of setae and feed on decaying organic matter
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Merriam-Webster unabridged
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Time Traveler for earthworm
The first known use of earthworm was in the 14th century
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