A minute pulmonate mollusc, Ancylus fluviatilis (family Planorbidae), which has a conical shell that resembles that of a limpet, occurring in freshwater in Eurasia.
Origin
Late 18th century; earliest use found in Emanuel Mendes da Costa (1717–1791), naturalist.
Definition of river limpet in US English:
river limpet
noun
A minute pulmonate mollusc, Ancylus fluviatilis (family Planorbidae), which has a conical shell that resembles that of a limpet, occurring in freshwater in Eurasia.
Origin
Late 18th century; earliest use found in Emanuel Mendes da Costa (1717–1791), naturalist.