Meaning

noun 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

noun a person who has a nasty or unethical character undeserving of respect

noun a software program capable of reproducing itself that can spread from one computer to the next over a network

originFrom German Worms, from Old High German Wormazia, Warmazia, etc., from Latin Vormatia, from a Gaulish name attested in Latin as Borbetomagus and Bormitomagus with influence from Latin -ātus (adjective-forming suffix) and -ia (toponym-forming suffix), of uncertain origin but usually conjectured to refer to the Celtic god Borvo or a river, spring, or other waters named for him + Proto-Celtic *magos…

Etymology from Wiktionary, CC BY-SA 3.0