- octagon (n.)
[octagon 词源字典]
- 1650s, from Latin octagonos, from Greek oktagononos, literally "eight-angled," from okta- comb. form of okto "eight" (see eight) + gonia "angle," related to gony "knee" (see -gon). Also octogon (1650s), from French octogone.[octagon etymology, octagon origin, 英语词源]