Relating to or existing in two planes; having two flat surfaces or dimensions.
From 'bi-' (two) and 'planar' (from Latin 'planus,' flat). A geometric or mathematical term used to describe structures with two planar elements.
In geometry, a biplanal structure exists in exactly two planes at once—imagine a butterfly's wings, which unfold along one axis but lie flat on two opposite sides of a center line.
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