Learn how to say Hecatomb correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word hecatomb:
(in ancient Greece or Rome) a great public sacrifice, originally of a hundred oxen.
an extensive loss of life for a particular cause:
they perished in the hecatomb arranged by the government
late 16th century: via Latin from Greek hekatombē (from hekaton ‘hundred’ + bous ‘ox’)