pedwerydd ar bymtheg ar hugain

== Welsh == === Alternative forms === 39ain (abbreviation) === Etymology === Literally, “fourth on fifteen on twenty”, or more loosely translated as “fourth on thirty-five”. === Adjective === pedwerydd ar bymtheg ar hugain (feminine singular pedwaredd ar bymtheg ar hugain, plural pedwerydd ar bymtheg ar hugain, not comparable) (ordinal number) thirty-ninth === Mutation ===