有理数这个词源很明确就来自希腊。jjww前维基百科搜一下并不难。


“Etymology
Although nowadays rational numbers are defined in terms of ratios, the term rational is not a derivation of ratio. On the contrary, it is ratio that is derived from rational... This unusual history originated in the fact that ancient Greeks "avoided heresy by forbidding themselves from thinking of those [irrational] lengths as numbers". So such lengths were irrational, in the sense of illogical, that is "not to be spoken about" ”

【 在 lvarez 的大作中提到: 】
: 拿英语单词扯希腊词源，果然厉害……
: :
--
修改:xunger FROM 124.205.122.*
FROM 124.205.122.*