Vermiform

Vermiform: adjective. Having the shape and/or physical characteristics of a worm. Also: 'Vermiform Appendix' is another term for the appendix.

Side note: "Wyrm", in old english (pronounced "Verm") means dragon. Not sure where the modern english for "worm" and "dragon" intersect, but I'd be interested to see if "vermiform" can be traced back that far, and if its original meaning was mythological.