Source : Webster's Revised Unabridged Dictionary (1913)

Acroceraunian \Ac`ro*ce*rau"ni*an\, a. [L. acroceraunius, fr.
   Gr. ? high, n. pl. ? heights + ? thunderbolt.]
   Of or pertaining to the high mountain range of
   ``thunder-smitten'' peaks (now Kimara), between Epirus and
   Macedonia. --Shelley.