Meaning of undecagon in English:

undecagon

Pronunciation /ʌnˈdɛkəɡ(ə)n/

noun

another term for hendecagon
‘These various polygon shapes consist of, but are not limited to, triangles, squares, pentagons, hexagons, heptagons, octagons, nonagons, decagons, undecagons, and dodecagons.’
another term for hendecagon
  • ‘How many diagonals are needed to divide a heptagon, a nonagon, and an undecagon into triangles?’

Origin

Early 18th century formed irregularly from Latin undecim ‘eleven’, on the pattern of decagon.