The Collaborative International Dictionary of English v.0.48:
Bdellomorpha \Bdel`lo*mor"pha\,n. [NL., fr. Gr. bde`lla leech + morfh` form.] (Zool.) An order of Nemertina, including the large leechlike worms (Malacobdella) often parasitic in clams. [1913 Webster]