- 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
--1 is a kind of invertebrate
--1 has particulars:- worm, louse, insect, dirt ball - a person who has a nasty or unethical character undeserving of respect
--2 is a kind of unpleasant person, disagreeable person
- worm - a software program 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"
--3 is a kind of malevolent program
- worm - screw thread on a gear with the teeth of a worm wheel or rack
--4 is a kind of screw
--4 is a part of worm gear - worm, louse, insect, dirt ball - a person who has a nasty or unethical character undeserving of respect