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deuteroconch. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Etymology
From deutero- + conch.
Noun
deuteroconch (plural deuteroconches or protoconchs)
- (zoology) The second chamber of ammonites and other cephalopods
1954, Alan Hilder Smout, Lower Tertiary Foraminifera of the Qatar Peninsula, British Museum (Natural History), page 25:A microspheric nucleoconch does not have an obvious deuteroconch, and is followed by a spiral nepionic stage, no matter what the adult chamber arrangement may be.