from The Century Dictionary.
- In Gegenbaur's system of classification, one of two primary divisions of the Mollusca, consisting of the chitons only.
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) 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.
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