frac•tal Pronunciation: (frak'tl), [key] —n. Math., Physics. a geometrical or physical structure having an irregular or fragmented shape at all scales of measurement between a greatest and smallest scale such that certain mathematical or physical properties of the structure, as the perimeter of a curve or the flow rate in a porous medium, behave as if the dimensions of the structure (frac'tal dimen'sions) are greater than the spatial dimensions.
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