dodecagon

A dodecagon is polygon that has twelve sides, just like an octogon has eight sides.

The -gon part of dodecagon should clue you in that this is a geometric figure. That leaves the dodeca- part, which means 12. A dodecagon is a polygon, just like a pentagon (five sides) and a hectogon (100 sides). The Greek roots make 12 by combining do (2) and deca (10). This combination of roots can also be found in dodecaphonism (musical composition using the 12-tone technique) and dodecastyle (having 12 columns on a side, which describes certain antique architecture).

Definitions of dodecagon
1

n a twelve-sided polygon

Type of:
polygon, polygonal shape
a closed plane figure bounded by straight sides

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.