tri deg un

== Welsh == === Etymology === From tri (“three”) +‎ deg (“ten”) +‎ un (“one”). === Pronunciation === (North Wales) IPA(key): /ˌtrɪdɛɡ ˈɨːn/ (South Wales) IPA(key): /ˌtriːdɛɡ ˈiːn/, /ˌtrɪdɛɡ ˈiːn/ === Numeral === tri deg un (cardinal number, decimal) thirty-one Synonym: un ar ddeg ar hugain === Mutation ===