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From: Webster's Revised Unabridged Dictionary (1913)

 Te·trag·o·nal a.
 1. Geom. Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers.
 2. Bot. Having four prominent longitudinal angles.
 3. Crystallog. Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization.