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Webster 1913 Edition

Protoconch

Pro′to-conch

,

Noun.

[

Proto-

+

conch

.]

(Zool.)

The embryonic shell, or first chamber, of ammonites and other cephalopods.

Definition 2025

protoconch

protoconch

English

Noun

protoconch ‎(plural protoconches or protoconchs)

(zoology) The embryonic shell, or first chamber, of ammonites and other cephalopods.