[clar.i.on] n [ME, fr. MF & ML; MF clairon, fr. ML clarion-, clario, fr. L clarus] (14c) 1: a medieval trumpet with clear shrill tones
2: the sound of or as if of a clarion
[2]clarion adj (1841): brilliantly clear "her ~ top notes"; also: loud and clear "a ~ call to action"