| Noun | 1. | Branchiobdellidae - small annelid worms with the posterior end modified into an adhesive sucker; especially formerly regarded as modified leeches worm family - a family of worms class Oligochaeta, Oligochaeta - earthworms Branchiobdella, genus Branchiobdella - type genus of the Branchiobdellidae: a small worm that lives on the gills or surface of a crayfish attached by a sucker |