前綴 ultra-

漢：來源於拉丁語，意爲(wèi)“beyond,exceeding”，可變形爲(wèi)ulter。
英：prefix meaning "beyond" (ultraviolet) or "extremely" (ultramodern), from L. ultra- from ultra (adv. and prep.) "beyond, on the further side," from PIE *al- "beyond." In common use from early 19c., it appears to have arisen from French political designations. As its own word, a noun meaning "extremist" of various stripes, it is first recorded 1817, from Fr. ultra, shortening of ultra-royaliste "extreme royalist."
1.表示“極耑”
ultra-democracy 極耑民主 ultrapure 極純的
ultra-reactionary 極耑反動的 ultra-left 極左的

2.表示“超，以外”
ultrasonic
a.relating to sound waves beyond the range of normal human audibility 超聲的，超音的 前綴ultra=beyond,詞根son=sound,-ic在此爲(wèi)形容詞後綴。
long-term exposure to ultrasonic sound can damage your hearing.
長期処在超聲環(huán)境中，會損傷你的聽覺
ultraviolet
a.of the invisible part of the spectrum beyond the violet 紫外（線）的 violet=violet ray
Honey bees see only ultraviolet light,so they see flowers quite differently than we do.
蜜蜂能看到紫外線，所以它們看到的花朵與我們看到的截然不同。