Source : Webster's Revised Unabridged Dictionary (1913)

Atellan \A*tel"lan\, a. [L. Atellanus, fr. Atella, an ancient
   town of the Osci, in Campania.]
   Of or pertaining to Atella, in ancient Italy; as, Atellan
   plays; farcical; ribald. -- n. A farcical drama performed at
   Atella.