Malacobdella \Mal`a*cob*del"la\, n. [NL., fr. Gr. malako`s soft
+ ? a leech.] (Zool.)
A genus of nemertean worms, parasitic in the gill cavity of
clams and other bivalves. They have a large posterior sucker,
like that of a leech. See Illust. of {Bdellomorpha}.
[1913 Webster]