taru-adjective, adverb taking the 'to' particle
Literary onomatopoeic word describing the gentle sound of flowing water, such as a stream or brook. Used as a taru-adjective or adverb with と. Rare in everyday speech; mainly found in classical or poetic contexts.
谷川の水が潺湲と流れている。
The mountain stream is babbling gently.
せんかんたる小川の音に耳を澄ませた。
I listened closely to the murmuring sound of the brook.