1. (noun)worm any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae
2. (noun)worm, louse, insect, dirt ball a person who has a nasty or unethical character undeserving of respect
3. (noun)worm a softwareprogram capable of reproducing itself that can spread from one computer to the next over a network "worms take advantage of automatic file sending and receiving features found on many computers"
5. (verb)writhe, wrestle, wriggle, worm, squirm, twist to move in a twisting or contorted motion, (especially when struggling) "The prisoner writhed in discomfort"; "The child tried to wriggle free from his aunt's embrace"
14. (noun)worm a short revolving screw, the threads of which drive, or are driven by, a wormwheel by gearing into its teeth or cogs. See Illust. of Worm gearing, below
1. worm [from tapeworm in John
Brunner's novelThe Shockwave Rider, via XEROX PARC]
A program that propagates itself over a network, reproducing itself as it
goes. Comparevirus. Nowadays the term has
negative connotations, as it is assumed that only
crackers write worms. Perhaps the best-known
example was Robert T. Morris's Great Worm of 1988, a
‘benign’ one that got out of control and hogged hundreds of
Suns and VAXen across the U.S. See also cracker,
RTM, Trojan horse,
ice.
Definition of worm 
