One of the mysteries of the English language finally explained.
Of or relating to the former molluscan division Placophora, now usually identified with the class Polyplacophora, which comprises the chitons.
A mollusc of the former division Placophora; a polyplacophoran.
Late 19th century; earliest use found in The Century Dictionary. From scientific Latin Placophora, class or division name + -an. With use as adjective compare placophorous.
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