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Webster 1913 Edition

Anaptychus

‖

An-ap′ty-chus

,

Noun.

;

pl.

Anaptichi

.

[NL., fr. Gr. [GREEK] unfolding;

ἀνά

back + [GREEK] to fold.]

(Paleon.)

One of a pair of shelly plates found in some cephalopods, as the ammonites.