bunsraith

== Irish == === Etymology === From bun- (“basic, primary, elementary”) +‎ sraith (“course, layer, stratum”). === Noun === bunsraith f (genitive singular bunsraithe, nominative plural bunsraitheanna) bottom layer, foundation (geology) substratum ==== Declension ==== === Mutation === === References === Ó Dónaill, Niall (1977), “bunsraith”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN