achtanaiméadar

== Irish == === Etymology === From achtana- (“actino-”) +‎ -méadar (“-meter”). === Noun === achtanaiméadar m (genitive singular achtanaiméadair, nominative plural achtanaiméadair) (physics) actinometer ==== Declension ==== ==== Related terms ==== achtanaiméadracht f (“actinometry”) === Mutation === === References === Ó Dónaill, Niall (1977), “achtanaiméadar”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN