nonagon Geom.
(ˈnɒnəgən)
[irreg. f. L. nōn-us ninth, after hexagon. Cf. OF. nongone.]
A figure having nine angles; an enneagon.
| 1688 R. Holme Armoury iii. xvi. (Roxb.) 98/1 An Henneagon, or Enneagon or Nonagon, a fort of nyne corners. a 1696 Scarburgh Euclid (1705) 174 Of the..Nonagon, Euclide makes no mention. 1817 Colebrooke Algebra 93 Next the proof of the side of the nonagon is shown. 1842 Gwilt Archit. 1008. |
b. Used adj. Nine-angled.
| 1754 Pococke Trav. (Camden) I. 72 They are making a nonagon building..where poultry..are to be kept. |