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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||sea cradle - primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates|
mollusc, mollusk, shellfish - invertebrate having a soft unsegmented body usually enclosed in a shell
genus Chiton - a genus of Polyplacophora
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