Tetragonal
Pronunciation : Te*trag"o*nal
Part of Speech : a.
Definition : 1. (Geom.)
Defn: 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.)
Defn: Having four prominent longitudinal angles.
3. (Crystallog.)
Defn: Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization.
Source : Webster's Unabridged Dictionary, 1913