taru-adjective, adverb taking the 'to' particle
smooth circular motion; rolling smoothly; spherical
Literary or formal word describing something moving in a smooth, round, or rolling manner. Often used adverbially with と (円転と). The gloss 'orotund' is rare and refers to a full, round sound or speech.
球が円転と転がっていった。
The ball rolled away with a smooth circular motion.
彼の演説は円転として響いた。
His speech resounded with a full, round tone.