the word 'stridor' has a direct lineage from latin, where 'strīdor' meant a harsh, grating, or creaking sound. this noun was derived from the verb 'strīdēre', which carried the core meaning of making a shrill noise, such as the sound of crickets, hinges, or whistling wind. the latin root can be traced further back to the proto-indo-european root (s)trei-, meaning to screech or make a harsh sound, which is also the ancestor of words like 'strike' and 'streak' in the sense of a sharp line or sound. the logical progression is clear: from a general ancient verb for screeching, to the specific latin verb for creaking, to the noun form describing the resulting sound itself, which entered english in the 17th century as a medical and descriptive term for a harsh, high-pitched noise.

Structure: strid (creak, grate) + or (agent/result suffix) strid (from latin strīdēre, meaning to creak, grate, hiss); or (from latin -or, a suffix forming nouns denoting a state or condition, or the result of an action).