octagon
词根词缀：
octagon n. 八角形
octa 八 + gon 角 → 八角形
October n. 十月（古罗马八月）
octogenarian n. 80~89岁的老人
octo 八 + gen 出生 + arian 表人 → 出生以后活了八十多年的人 → 80~89岁的老人
octolateral adj. 八边的
octo 八 + later 边 + al …的 → 八边的
octopus n. 章鱼
octo 八 + pus 足 → 八爪鱼 → 章鱼
数据来源：新东方英语词汇速记大全
相关例句：
Design of Finish Forging Die for American-style Octagon Hammer
美式八角锤终锻模设计
This paper makes a theoretical analysis of dynamometer for surface grinding of the octagon ring and establishes an accurate theoretical mathematical model for the design of its structure.
本文对八角环平面磨削力测试仪进行了理论分析，建立了其结构设计的精确理论数学模型。
On the Number of Lattice Points in a Regular Octagon Numerical Analysis of Natural Convection in a Cylindrical Envelope with an Internal Concentric Slotted Octagon
正八边形内整点问题圆内开缝八边形自然对流换热的数值分析
Design and Experiment of Octagon Solid Die Die cave 3-D solid modeling
八角整体锭模的设计与初步试验
Design of Octagon Gasket Sealing Structure for High Pressure Vessels
八角垫高压密封结构的设计
In many areas of our country, mysterious picture writings of octagon appeared printed block of Hanshan Yu and Da Wenkou pottery also have the same picture writings.
我国乃至美洲的很多地方屡屡出现八角星形神秘图，含山玉版、大汶口陶尊、双猪玉龙等上就有这种图纹。