ROUNDEL Meaning of ROUNDEL in English [roun.del] n [ME, fr. OF rondel, fr. roont round--more at round] (14c) 1: a round figure or object (as a circular panel, window, or niche) 2. a: rondel 2a b: an English modified rondeau Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012