Home›Dictionary›decagondecagonnounten-sided shapeL319138 on Wikidata ↗WiktionaryPronunciation: /ˈdɛ.kə.ɡɑn/ / /ˈdɛ.kə.ɡən/nounEtymology: From deca- + -gon.A polygon with ten sides and ten angles.