Usually means: Primitive scales found on sharks.
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We found 9 dictionaries that define the word placoidian:

General (8 matching dictionaries)
  1. placoidian: Wordnik
  2. placoidian: Wiktionary
  3. Placoidian, placoidian: Dictionary.com
  4. Placoidian: Online Plain Text English Dictionary
  5. placoidian: Webster's Revised Unabridged, 1913 Edition
  6. Placoidian: AllWords.com Multi-Lingual Dictionary
  7. placoidian: FreeDictionary.org
  8. placoidian: TheFreeDictionary.com

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

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Definitions from Wiktionary (placoidian)

▸ noun:  (zoology, dated) A placoid fish.

Similar:
placoid, placoderm, platycephalid, platyrhinid, placozoon, placunid, aplodactylid, microplacoid, dinichthyid, pholid, more...

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Similar:
placoid, placoderm, platycephalid, platyrhinid, placozoon, placunid, aplodactylid, microplacoid, dinichthyid, pholid, more...



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