trydydd ar ddeg

== Welsh == === Alternative forms === 13eg (abbreviation) === Etymology === From trydydd (“third”) +‎ ar (“on”) +‎ deg (“ten”). === Pronunciation === (North Wales) IPA(key): /ˌtrədɨ̞ð ar ˈðeːɡ/ (South Wales, standard, colloquial) IPA(key): /ˌtrədɪð ar ˈðeːɡ/ (South Wales, colloquial) IPA(key): /ˌtrɪdɪð ar ˈðeːɡ/ === Adjective === trydydd ar ddeg (feminine singular trydedd ar ddeg, plural trydydd ar ddeg, not comparable) (ordinal number) thirteenth === Mutation ===