Anaptychus

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Anaptychus (Paleon) One of a pair of shelly plates found in some cephalopods, as the ammonites.
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Century Dictionary and Cyclopedia
    • n anaptychus One of the heart-shaped plates divided by a suture found in some fossil cephalopods, as goniatites and ammonites.
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Etymology

Webster's Revised Unabridged Dictionary
NL., fr. Gr. unfolding; back + to fold