purism n.

"stickler for purity, one who aims at or insists on a scrupulous purity," 1706, from pure + -ist; on model of French puriste (1580s). Originally and particularly in reference to speech. Related: Puristic.

word-forming element making nouns implying a practice, system, doctrine, etc., from French -isme or directly from Latin -isma, -ismus (source also of Italian, Spanish -ismo, Dutch, German -ismus), from Greek -ismos, noun ending signifying the practice or teaching of a thing, from the stem of verbs in -izein, a verb-forming element denoting the doing of the noun or adjective to which it is attached. For distinction of use, see -ity. The related Greek suffix -isma(t)- affects some forms.