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proto- +‎ conch


protoconch (plural protoconches or protoconchs)

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

Coordinate terms[edit]

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for protoconch in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)