Aircéach

== Irish == === Etymology === (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) === Adjective === Aircéach (genitive singular masculine Aircéach, genitive singular feminine Aircéiche, plural Aircéacha, not comparable) (geology) Archaean ==== Declension ==== === Mutation === === Further reading === Ó Dónaill, Niall (1977), “Aircéach”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN