heptagon
七角形(hepta+gon 角)
释义2:
heptagon
/ 5heptEɡEn /
◙ noun1. a plane figure with seven straight sides and angles• 七边形,七角形【派生】
♦ heptagonal adjective【语源】
1. late 16th cent.: from Greek heptagonon, neuter (used as a noun) of heptagonos 'seven-angled'
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