"In physics, a Moiré Pattern is an interference pattern created, for example, when two grids are overlaid at an angle, or when they have slightly different mesh sizes. The term originates from moiré, a type of textile, traditionally of silk but now also of cotton or synthetic fiber, with a rippled or ‘watered’ appearance. The history of the word moiré is complicated. The earliest agreed origin is the Arabic mukhayyar (مُخَيَّر in Arabic, which means chosen), a cloth made from the wool of the Angora goat, from khayyara (خيّر in Arabic), ‘he chose’ (hence ‘a choice, or excellent, cloth’). It has also been suggested that the Arabic word was formed from the Latin marmoreus, meaning ‘like marble’. By 1570 the word had found its way into English as mohair. This was then adopted into French as mouaire, and by 1660 (in the writings of Samuel Pepys) it had been adopted back into English as moire or moyre. Meanwhile the French mouaire had mutated into a verb, moirer, meaning ‘to produce a watered textile by weaving or pressing’, which by 1823 had spawned the adjective moiré. Moire (pronounced “mwar”) and moiré (pronounced “mwar-ay”) are now used somewhat interchangeably in English, though moire is more often used for the cloth and moiré for the pattern.”
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