The definition of strident is something loud, harsh-sounding or shrill.(adjective)
An example of strident is the sound of an angry mob.
See strident in Webster's New World College Dictionary
Origin: L stridens, prp. of stridere, to make a grating noise, rasp < IE echoic base *(s)trei- > Gr trizein, to chirp, screech, L strix, screech owl
See strident in American Heritage Dictionary 4
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