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anaptychus

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Anaptychus

An*ap"ty*chus\, n.; pl. Anaptichi. [NL., fr. Gr. ? unfolding; ? back + ? to fold.] (Paleon.) One of a pair of shelly plates found in some cephalopods, as the ammonites.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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