a plane figure with twelve angles and twelve sides
Word origin
Gr dōdekagōnon: see dodeca- & -gon
dodecagon in American English
(douˈdekəˌɡɑn, -ɡən)
noun
Geometry
a polygon having 12 angles and 12 sides
Also: duodecagon
Derived forms
dodecagonal (ˌdoudeˈkæɡənl)
adjective
Word origin
[1650–60; dodeca- + -gon]This word is first recorded in the period 1650–60. Other words that entered Englishat around the same time include: cardholder, parameter, pony, siphon, syllabus