A closed plane figure bounded by three or more line segments.
[Late Latin polygōnum, from Greek polugōnon, from neuter of Greek polugōnos, polygonal : polu-, poly- + -gōnos, angled; see -GON.]
po·lygo·nal (pə-lĭgə-nəl) adj.
(click for a larger image)polygon
regular (left) and irregular (right) polygons
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.