adjectiveaidiacht1zoologyzó-eolaíochtactive at nightoíchegs as adjcmuthe owl is nocturnalis éan oíche é an t-ulchabhánnocturnal animalsainmhithe oíche2happening at nighta nocturnal walksiúlóid oíche3staying up at nighthe's a nocturnal creaturebíonn sé ina shuí i rith na hoíche