Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of protoconch is as below...

Protoconch :: Protoconch (n.) The embryonic shell, or first chamber, of ammonites and other cephalopods..

Prosiphon :: Prosiphon (n.) A minute tube found in the protoconch of ammonites, and not connected with the true siphon..

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