円えん転てん

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.

• 球きゅうが円えん転てんと転ころがっていった。

  The ball rolled away with a smooth circular motion.

• 彼かれの演えん説ぜつは円えん転てんとして響ひびいた。

  His speech resounded with a full, round tone.