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heptagon

n. 七角形；[数] 七边形

中文词源

heptagon 七边形

来自希腊语hepta,七，词源同seven,-gon,边，角，词源同knee,hexagon.

heptagon (n.): 1560s, from Middle French heptagon, from Greek heptagonon, from hepta "seven" (cognate with Latin septem, Gothic sibun, Old English seofon; see seven) + gonia "angle" (see -gon). Related: Heptagonal.