pedwerydd ar bymtheg a thrigain

== Welsh == === Alternative forms === 79ain (abbreviation) === Etymology === Literally, “fifth on fourteen and thirty”. === Adjective === pedwerydd ar bymtheg a thrigain (feminine singular pedwaredd ar bymtheg a thrigain, plural pedwerydd ar bymtheg a thrigain, not comparable) (ordinal number) seventy-ninth === Mutation ===