undecagonn.
/ʌnˈdɛkəɡ(ə)n/, /ʌnˈdɛkəɡɒn/, U.S. /ˌənˈdɛkəˌɡɑn/ Geometry.
A plane figure having eleven sides and angles.
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the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > with ten or more sides or angles
quindecagon1570
quindecangle1636
hendecagon1649
decagona1652
dodecagon1658
quatuordecangle1667
myriagon1674
chiliagon1692
pendecagon1695
undecagon1728
1728 E. Chambers Cycl. Undecagon, is a regular Polygon of eleven Sides.
1798 C. Hutton Course Math. I. 267 A Pentagon is a polygon of five sides..an Undecagon, eleven.
1879 Cassell's Techn. Educator (new ed.) I. 251.
This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022).
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