hec·a·tomb 
(hĕkə-tōm′)
(hĕkə-tōm′)n.
1. A large-scale sacrifice or slaughter.
2. A sacrifice to the ancient Greek or Roman gods consisting originally of 100 oxen or cattle.
[Latin hecatombē, from Greek hekatombē : hekaton, hundred; see dek in the Appendix of Indo-European roots + -bē, oxen; see gwou- in the Appendix of Indo-European roots.]