of or relating to the number five, in particular 五的,尤指 ■of the fifth order or rank 第五的 ■(Zoology, historical)relating to or denoting a former system of classification in which the animal kingdom is divided into five subkingdoms, and each subkingdom into five classes (动 史)(动物界分类)五分体系的
语源
early 17th cent.: from Latin quinarius, from quini 'five at once, a set of five', from quinque 'five'