The Collaborative International Dictionary
Tetragonal \Te*trag"o*nal\, a.
(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.
(Bot.) Having four prominent longitudinal angles.
(Crystallog.) Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization.
Wiktionary
a. 1 Having four sides (as a tetragon); quadrilateral. 2 (context crystallography English) Having two equal axes and one unequal, and all angles 90°.
WordNet
adj. of or relating to or shaped like a quadrilateral
Usage examples of "tetragonal".
The two latter are tetragonal in crystallization, whilst brookite is orthorhombic.
The second ship, one of the patrol class, had left its station on the tetragonal array, and boosted to intercept.