taru-adjective, adverb taking the 'to' particle
Literary or poetic word describing a rich, pleasant scent, often of flowers, incense, or fine alcohol. Used as a たる adjective or adverbially with と.
庭には馥郁たる花の香りが漂っていた。
A fragrant scent of flowers hung in the garden.
馥郁としたコーヒーの香りに包まれる。
I am enveloped in the rich aroma of coffee.
The kanji 馥 and 郁 both carry meanings related to fragrance. The exact historical derivation of the compound is uncertain, but it has been used in classical Chinese and Japanese literature to describe rich scents.