Noun
A sacrifice of a hundred oxen or cattle at the same time; hence, the sacrifice or slaughter of any large number of victims.
Source: Webster's dictionaryBlinded by the Light As the team recovers from Hecatomb attack in Rogue's childhood home, it appears that Mystique and Iceman begin a romantic relationship. Source: Internet
Even as he did so, he saved many lives by containing the explosion of the Conquistador, and, later, the Hecatomb itself. Source: Internet