bray (n.)

"a harsh cry," especially that of an ass, c. 1300, from bray (v.).

bray (v.)

"utter a loud and harsh cry," c. 1300, from Old French braire "to cry," from Gallo-Roman *bragire "to cry out" (11c.), perhaps from a Celtic source (compare Gaelic braigh "to shriek, crackle"), probably imitative. Related: Brayed; braying.