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English definition of “heptagon”

heptagon

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