anaptychus

English

Etymology

From New Latin anaptychus, from Ancient Greek ἀνάπτυχος (anáptukhos, “unfolding”), from ἀναπτύσσω (anaptússō, “to unfold”).

Noun

anaptychus (plural anaptychi)

1. (paleontology) One of a pair of shelly plates found in some cephalopods, such as the ammonites. They are now considered to have been parts of the jaw.

References

• “anaptychus”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.