from the GNU version of the Collaborative International Dictionary of English
- n. Any one of numerous species of trematode worms belonging to Tristoma and allied genera having a large posterior sucker and two small anterior ones. They usually have broad, thin, and disklike bodies, and are parasite on the gills and skin of fishes.
from The Century Dictionary and Cyclopedia
- n. A genus of monogeneous trematoid worms, typical of the family Tristomidæ: so called from one large ventral sucker behind two smaller adoral ones. They are of broad and flat oval or discoid form, and infest the skin and gills of fishes.
- n. A worm of the above genus.
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