Usually means: Initial larval shell of mollusks.
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We found 11 dictionaries that define the word protoconch:

General (10 matching dictionaries)
  1. protoconch: Merriam-Webster
  2. protoconch: Wordnik
  3. protoconch: Wiktionary
  4. Protoconch, protoconch: Dictionary.com
  5. Protoconch: Wikipedia, the Free Encyclopedia
  6. Protoconch: Online Plain Text English Dictionary
  7. protoconch: Webster's Revised Unabridged, 1913 Edition
  8. Protoconch: AllWords.com Multi-Lingual Dictionary
  9. protoconch: FreeDictionary.org
  10. Protoconch: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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Definitions from Wiktionary (protoconch)

▸ noun:  (zoology) The embryonic shell, or initial chamber, of ammonites and other cephalopods

Similar:
nucleoconch, ammonitella, prodissoconch, microconchid, prosiphon, living chamber, teloconch, holostome, coenoblast, dissoconch, more...

Opposite:
teleoconch, adult shell, mature shell

Adjectives:
smooth, large, small, bulbous, whorled, typical, multispiral, shaped, brown, coiled, membranous

▸ Words similar to protoconch

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Similar:
nucleoconch, ammonitella, prodissoconch, microconchid, prosiphon, living chamber, teloconch, holostome, coenoblast, dissoconch, more...

Opposite:
teleoconch, adult shell, mature shell

Adjectives:
smooth, large, small, bulbous, whorled, typical, multispiral, shaped, brown, coiled, membranous



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