Synset
a closed plane figure bounded by straight sides
<noun.shape>
polygon
polygonal shape
semantic pointers
hypernym
plane figure, two-dimensional figure
hyponym
isogon
convex polygon
concave polygon
quadrilateral, quadrangle, tetragon
triangle, trigon, trilateral
pentagon
hexagon
heptagon
octagon
nonagon
decagon
undecagon
dodecagon
spherical polygon