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
2 : limbless scaly elongate reptile; some are venomous
3 : a soft thick wormlike larva of certain beetles and other insects
4 : any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms
