worm

Dictionary definition · 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
a person who has a nasty or unethical character undeserving of respect
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"
screw thread on a gear with the teeth of a worm wheel or rack

to move in a twisting or contorted motion, (especially when struggling)"The prisoner writhed in discomfort"

Source: Open English WordNet (CC BY 4.0).