hecatomb (n.) Look up hecatomb at Dictionary.com
1590s, from Latinized form of Greek hekatombe, properly (and literally) "offering of 100 oxen," but generally "a great public sacrifice." It is a compound of hekaton "one hundred," which perhaps is dissimilated from *hem-katon, with hen, neuter of eis "one" + *katon "hundred." The second element is bous "ox" (see cow (n.)). The first month of the Attic calendar (corresponding to July-August) was Hekatombaion, in which sacrifices were made.