ἐκατομβάδων, in chronology, the first month of the Athenian year. It consisted of 30 days, and began on the first new moon after the summer solstice, and consequently answered to the latter part of our June and beginning of July. The Boeotians called it Hippodromus, and the Macedonians Louis. See Month. The word is a derivative from the Greek ἐκατόμβη, a hecatomb, because of the great number of hecatombs sacrificed in it.