trettio

== Swedish == === Etymology === From Old Swedish þrætighi, from Proto-Germanic *þrīz tigiwiz (“thirty”, literally “three tens”); later reformed after tre +‎ tio. === Pronunciation === IPA(key): /²trɛtɪ.ʊ/, /²trɛtɪ/ === Numeral === trettio thirty ==== Coordinate terms ==== ==== Derived terms ==== trettionde trettiondel === Further reading === trettio in Svensk ordbok.