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 | any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth |
screw thread on a gear with the teeth of a worm wheel or rack | |
a software program capable of reproducing itself that can spread from one computer to the next over a network | |
a person who has a nasty or unethical character undeserving of respect | |