from The Century Dictionary.
- noun A genus of worms, formerly supposed to be leeches, now considered to be parasitic nemerteans, type of a family Malacobdellidæ. M. grossa is a parasite found in the gills of various mollusks.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Zoöl.) 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
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