hecatomb (n.) Look up hecatomb at Dictionary.com
1590s, from Greek hekatombe "offering of 100 oxen," but generally "a great public sacrifice," from hekaton "one hundred" (perhaps from hen, neuter of eis "one" + *katon "hundred") + bous "ox." The first month of the Attic calendar (corresponding to July-August) was Hekatombaion, in which sacrifices were made.