tetragonal
adjective
te·trag·o·nal te-ˈtra-gə-nᵊl 
: of, relating to, or characteristic of the tetragonal system
tetragonally
te-ˈtra-gə-nᵊl-ē
adverb 
Example Sentences
Recent Examples on the Web The technicolor models are made of a pure ceramic called tetragonal zirconia polycrystal, which contains 95% zirconia. 
Carol Besler, Robb Report, 14 July 2021
Carol Besler, Robb Report, 14 July 2021 Word History
Etymology
Late Latin tetragonalis having four angles and four sides, from tetragonum quadrangle, from Greek tetragōnon, from neuter of tetragōnos tetragonal, from tetra- + gōnia angle — more at -gon
First Known Use
1868, in the meaning defined above