ˈnənˌdīn, -_də̇n noun
( -s )
Etymology: Latin nundinae, plural, market time, literally, nine days, from nundinus of nine days, alteration of novem dies nine days, from novem nine + dies day; from its being held every ninth day of the Roman calendar — more at nine , deity
: a market day held every ninth day according to ancient Roman reckoning