Etymology
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stridor (n.)
"harsh, creaking noise, shrill sound," 1630s, from Latin stridor, from stridere (see strident).
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stridulous (adj.)
1610s, from Latin stridulus "giving a shrill sound, creaking," from stridere "to utter an inarticulate sound, grate, creak" (see strident). Stridulation is from 1831. Stridulate (v.) first recorded 1838. Related: Stridulated; stridulating; stridulously; stridulousness.
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strident (adj.)
1650s, from French strident (16c.) and directly from Latin stridentem (nominative stridens), present participle of stridere "utter an inarticulate sound, grate, screech," from PIE *(s)trei-, possibly of imitative origin (source also of Greek trismos "a grinding, scream"). Related: Stridently; stridence; stridency.
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