Clarion \Clar"i*on\, n. [OE. clarioun, OF. clarion, F. clairon, LL. clario, claro; so called from its clear tone, fr. L. clarus clear. See Clear.]

A kind of trumpet, whose note is clear and shrill.

He sounds his imperial clarion along the whole line of battle. --E. Everett.

Source: Webster's Revised Unabridged Dictionary (1913)