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English definition of “heptagon”

heptagon

noun [C]     /ˈhep.tə.ɡən/ US  /-ɡɑːn/
a shape with seven straight sidesGeometrical shapesSpherical, circular and annular objects heptagonal     /hepˈtæɡ.ən.əl/ adjective Geometrical shapesSpherical, circular and annular objects
(Definition of heptagon noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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