‖n. pl. [ NL., fr. L. hirudo, hirudinis, a leech. ] (Zool.) An order of Annelida, including the leeches; -- called also Hirudinei. [ 1913 Webster ]
n. Any of a number of carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end. Syn. -- leech, bloodsucker. [ WordNet 1.5 ]