Webster's English Dictionary

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tetragonal

te.trag.o.nal \te-'trag-*n-*l\ \-*l-e-\ aj [LL tetragonalis, fr. tetragonum 
   quadrangle, fr. Gk tetrago-n]on, fr. neut. of tetrago-nos tetragonal, fr. 
   tetra- + go-nia angle - more at -GON 1: having four angles and four sides  
   2: of, relating to, or characteristic of the tetragonal system  - 
   te.trag.o.nal.ly av