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heptagonal adjective

  /hɛpˈtæɡ ə nl/
  • Having seven angles and sides.
 siebeneckig

heptagon noun

  /ˈhɛp.tə.ɡɒn/ , /ˈhɛp.tə.ɡən/
  • (geometry) A polygon with seven sides and seven angles.
 Siebeneck, Heptagon
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