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Chiton, any of an order (Polyplacophora) of primitive mollusks with shells of light overlapping plates and a muscular foot that clings to rocks. Found on shores worldwide, chitons feed on algae scraped from the rocks. They range in length from 1/2 in (1.2 cm) to 1 ft (28.8 cm).

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Children's literature to Clumber spaniel