Source : Webster's Revised Unabridged Dictionary (1913)

Hecatomb \Hec"a*tomb\, n. [L. hecatombe, Gr. ?; ? hundred + ?
   ox: cf. F. h['e]catombe.] (Antiq.)
   A sacrifice of a hundred oxen or cattle at the same time;
   hence, the sacrifice or slaughter of any large number of
   victims.

         Slaughtered hecatombs around them bleed. --Addison.

         More than a human hecatomb.              --Byron.

Source : WordNet®

hecatomb
     n : a great sacrifice; an ancient Greek or Roman sacrifice of
         100 oxen