worm noun definition in Invertebrates topic from the Oxford Advanced Learner's Dictionary

worm

 noun: Invertebrates topic
1 [countable] a long thin creature with no bones or legs, that lives in soil birds looking for worms Worms burrow down through the soil.2 worms [plural] long thin creatures that live inside the bodies of humans or animals and can cause illness The dog has worms.3 [countable] the young form of an insect when it looks like a short worm This apple is full of worms.

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