n. In ancient Greece or Rome, a great feast and public sacrifice to the gods, originally of a hundred oxen.
n. Any great sacrifice; a great number of people, animals or things, especially as sacrificed or destroyed; a large amount.
the GNU version of the Collaborative International Dictionary of English
n. A sacrifice of a hundred oxen or cattle at the same time; hence, the sacrifice or slaughter of any large number of victims.
The Century Dictionary and Cyclopedia
n. In classical antiquity, a sacrifice of a hundred oxen or other beasts of one kind; hence, any great sacrifice of victims; any great slaughter of persons or animals.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a great sacrifice; an ancient Greek or Roman sacrifice of 100 oxen
Word Usage
"'As for amusement, I could kill rats as I used to do; or slaughter a hecatomb of pheasants at Babington,' -- here the old man winced, though the word hecatomb reconciled him a little to the disagreeable allusion."