1. (Science: geometry) 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. (Science: botany) Having four prominent longitudinal angles.

3. (Science: chemistry) Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization.

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