This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A closed plane figure bounded by three or more line segments.

n. A plane figure bounded by straight edges.

n. The boundary of such a figure.

n. A figure comprising vertices and (not necessarily straight) edges, alternatingly.

n. Such a figure and its interior, taken as a whole.

n. A plane figure having many angles, and consequently many sides; esp., one whose perimeter consists of more than four sides; any figure having many angles.

n. In geometry, a closed figure formed by the intersections of a number of straight lines, each with two others; especially, a plane figure of this sort; a figure with numerous angles

n. two sets of n lines, each cutting all the lines of the other set upon one curve of the nth order.

n. A train of sects whose last point is identical with the first.

n. In ordnance, a place especially arranged for making ballistic tests of guns, projectiles, armor, and powder. Same as proving-ground.

n. a closed plane figure bounded by straight sides

"His mathematical friends could have told him, that though it was talked of as a polygon, it was not supposed to be a square; but _polygon_ would not have rhymed to _stare_; and poets, when they launch into the ocean of words, must have an eye to the helm; at all events a poet, who is not supposed to be a student of the exact sciences, may be forgiven for a mathematical blunder."

two-dimensional figure    plane figure   

displacement-polygon    plane polygon    polygon of forces    gaucnh polygon    cyclic polygon    undivided polygon    polygonal masonry    reëntering polygon    funicular polygon    skew polygon   

polygonal   

undecagon    isogon    trilateral    decagon    trigon    octagon    spherical polygon    convex polygon    hexagon    pentagon   

frequency polygon    cumulative frequency polygon    polygon of forces   

parallelogram    tetrahedron    pentagon    semicircle    p&p    powershell    trapezoid    quadrilateral    lunette    polyline