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We found 9 dictionaries with English definitions that include the word aptychus:
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General dictionaries General (8 matching dictionaries)
  1. aptychus: Wordnik [home, info]
  2. Aptychus, aptychus: Dictionary.com [home, info]
  3. Aptychus: Wikipedia, the Free Encyclopedia [home, info]
  4. Aptychus: Online Plain Text English Dictionary [home, info]
  5. aptychus: Webster's Revised Unabridged, 1913 Edition [home, info]
  6. Aptychus: AllWords.com Multi-Lingual Dictionary [home, info]
  7. aptychus: Free Dictionary [home, info]
  8. Aptychus: Dictionary/thesaurus [home, info]

Medicine dictionaries Medicine (1 matching dictionary)
  1. aptychus: online medical dictionary [home, info]

Quick definitions (aptychus)

  • (n.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.

    (This definition is from the 1913 Webster's Dictionary and may be outdated.)


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