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We found 9 dictionaries with English definitions that include the word aptychus: Click on the first link on a line below to go directly to a page where "aptychus" is defined. General (8 matching dictionaries) aptychus: Wordnik [home, info] Aptychus, aptychus: Dictionary.com [home, info] Aptychus: Wikipedia, the Free Encyclopedia [home, info] Aptychus: Online Plain Text English Dictionary [home, info] aptychus: Webster's Revised Unabridged, 1913 Edition [home, info] Aptychus: AllWords.com Multi-Lingual Dictionary [home, info] aptychus: Free Dictionary [home, info] Aptychus: Dictionary/thesaurus [home, info] Medicine (1 matching dictionary) 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 (This definition is from the 1913 Webster's Dictionary and may be outdated.)