radharceolaíocht

== Irish == === Etymology === From radharc (“sight”) +‎ eolaíocht (“science”). === Noun === radharceolaíocht f (genitive singular radharceolaíochta) (physics) optics ==== Declension ==== ==== Synonyms ==== optaic ==== Related terms ==== optach (“optic”, adjective) optúil (“optical”, adjective) radharceolaí m (“optician”) === Further reading === Ó Dónaill, Niall (1977), “radharceolaíocht”, in Foclóir Gaeilge–Béarla [Irish–English Dictionary], Dublin: An Gúm, →ISBN