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earthworm
(-wʉrm′)
noun
any of a number of oligochaetous worms that burrow in the soil, esp. any of a genus (Lumbricus) very important in aerating and fertilizing the soil
See earthworm in American Heritage Dictionary 4
noun
Any of various terrestrial annelid worms of the class Oligochaeta, especially those of the family Lumbricidae, that burrow into and help aerate and enrich soil.
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