资料来源 : pyDict

十一边形

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Undecagon \Un*dec"a*gon\, n. [L. undecim eleven + Gr. ? an
   angle.] (Geom.)
   A figure having eleven angles and eleven sides.

资料来源 : WordNet®

undecagon
     n : an eleven-sided polygon