from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a polygon with eleven edges and eleven angles.
from the GNU version of the Collaborative International Dictionary of English
- n. A plane figure of eleven sides and eleven angles.
from The Century Dictionary and Cyclopedia
- n. In geometry, a plane figure of eleven sides and as many angles. Also endecagon.
Sorry, no etymologies found.
It's one thing to believe in pyramid power, and it's something else to drive on a tire shaped like a pyramid-especially when it's matched with a rhombus, a hendecagon, and a trapezium.
It is also found in hendecasyllable, hendecagon, and hendecahedron.