資料來源 : Webster's Revised Unabridged Dictionary (1913)

Anaptychus \An*ap"ty*chus\, n.; pl. {Anaptichi}. [NL., fr. Gr. ?
   unfolding; ? back + ? to fold.] (Paleon.)
   One of a pair of shelly plates found in some cephalopods, as
   the ammonites.