lew.is
n.(名词)A dovetailed iron tenon made of several parts and designed to fit into a dovetail mortise in a large stone so that it can be lifted by a hoisting apparatus.Also called lewisson 起重爪,吊楔:燕尾形铁榫,由几部分构成,可以拼拢嵌进一块巨石上的燕尾形榫眼,由此可通过一个起吊装置举起大石也作 lewisson
来源:Perhaps from the name Lewis 可能源自名字 Lewis