This is the 14970th most frequent Russian word.
подорожавшей
"Подорожавшей" means "that has become more expensive" in English.
The word "подорожавшей" is used as an adjective describing the oil that has increased in price.
Цены на товары увеличились из-за подорожавшей нефти.
The prices of goods have risen due to the increased price of oil.
Here, "подорожавшей" qualifies "валютой", indicating it is the currency that experienced an increase in value.
Подорожавшей валютой оказалась местная денежная единица.
The currency that has increased in value turned out to be the local monetary unit.
The term "подорожавшей" serves to describe the products whose prices have risen.