worm

noun

1.
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
made
Derived from:
wormy
2.
a person who has a nasty or unethical character undeserving of respect
dirt ball insect louse
3.
a software program capable of reproducing itself that can spread from one computer to the next over a network
4.
screw thread on a gear with the teeth of a worm wheel or rack