[te-trag-uh-nl] 
| 1. | pertaining to or having the form of a tetragon. |
| 2. | Crystallography. noting or pertaining to a system of crystallization in which all three axes are at right angles to one another, two being equal in length and the third being of a different length. |
| tet·ra·gon (tět'rə-gŏn') n. A four-sided polygon; a quadrilateral. [Late Latin tetragōnum, from Greek tetragōnon : tetra-, tetra- + -gōnon, -gon.] te·trag'o·nal (tě-trāg'ə-nəl) adj., te·trag'o·nal·ly adv. |
| tetragonal (tě-trāg'ə-nəl) Pronunciation Key
Relating to a crystal having three axes, two of which are of the same length and are at right angles to each other. The third axis is perpendicular to these. The mineral zircon has tetragonal crystals. See illustration at crystal. |
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