One of the mysteries of the English language finally explained.
A class of mainly extinct univalved marine molluscs with a limpet-shaped shell, whose surviving members are found in deep water. Also (usually in form monoplacophora): molluscs of this class.
1950s; earliest use found in Nature: a weekly journal of science. From scientific Latin Monoplacophora, class name from mono- + ancient Greek πλακο-, πλάξ flat plate, tablet + -ϕόρος, after Polyplacophora.
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