Source : Webster's Revised Unabridged Dictionary (1913)

Placophora \Pla*coph"o*ra\, n. pl. [NL., from Gr. ?, ?, tablet +
   ? to bear.] (Zo["o]l.)
   A division of gastropod Mollusca, including the chitons. The
   back is covered by eight shelly plates. Called also
   {Polyplacophora}. See Illust. under {Chiton}, and
   {Isopleura}.