Definition of worm noun from the Oxford Advanced Learner's Dictionary

     

    worm

     noun
    noun
    BrE BrE//wɜːm//
     
    ; NAmE NAmE//wɜːrm//
     
    Computer problems, Invertebrates
     
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  1. 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. see also earthworm, lugworm See related entries: Invertebrates
  2. 2 worms [plural] long thin creatures that live inside the bodies of humans or animals and can cause illness The dog has worms. see also hookworm, tapeworm See related entries: Invertebrates
  3. 3 [countable] the young form of an insect when it looks like a short worm This apple is full of worms. see also glow-worm, silkworm, woodworm See related entries: Invertebrates
  4. 4 [countable] (computing) a computer program that is a type of virus and that spreads across a network by copying itself See related entries: Computer problems
  5. 5[countable, usually singular] (informal, disapproving) a person you do not like or respect, especially because they have a weak character and do not behave well towards other people
  6. Word Origin Old English wyrm (noun), of Germanic origin; related to Latin vermis ‘worm’ and Greek rhomox ‘woodworm’.Idioms (informal) if you open up a can of worms, you start doing something that will cause a lot of problems and be very difficult
    the early bird catches the worm
     
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    (saying) the person who takes the opportunity to do something before other people will have an advantage over them
    (saying) a person who is normally quiet and does not complain will protest when the situation becomes too hard to bear
See the Oxford Advanced American Dictionary entry: worm