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tetrachord
tetracid
tetracyclic
tetracycline
tetrad
tetradactylous
tetradymite
tetraethyl lead
tetragon
tetragram
Tetragrammaton
tetrahedra
tetrahedrite
tetrahedron
tetrahydrocannabinol
tetrahydrothiophene
tetrahydroxy
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tetragon
tet·ra·gon [ téttrə gòn ] (plural tet·ra·gons)


noun 
Definition:
 
quadrilateral: a two-dimensional geometric figure formed of four sides and four angles
[Early 17th century. < late Latin tetragonum< Greek tetragōnos "four-angled" < gōnos "angled"]

te·trag·o·nal [ te trággən'l ] adjective
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