词族 · icosahedron
词形变化
英语词源
- icosahedron (n.)
- 1560s, from Greek eikosahedron, neuter of eikosahedros, from eikosi "twenty" + -hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary). Greek eikosi is from PIE *wikmti- "twenty," from *wi- "in half," hence "two" + (d)kmti-, from root *dekm- "ten" (see ten).
权威例句
- 1. The last of these figures known to Plato is the icosahedron.
- 柏拉图知道的最后一个这种构形是正二十面体.