heptagonnoun [ C ]uk /ˈhep.tə.ɡən/ us /-ɡɑːn/
adjective us uk /hepˈtæɡ.ən.əl/
(Definition of “heptagon” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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an area, often covered with sand or rocks, where there is very little rain and not many plants