pleuroconch
/ˈplʊərə(ʊ)kɒn(t)ʃ/ /ˈplʊərə(ʊ)kɒŋk/Zoology
noun
A bivalve mollusc having valves of unequal size; (formerly) specifically †a member of the former division Pleuroconchae of molluscs so characterized ( obsolete ).
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From pleuro- + conch, after French pleuroconque.