phi

phi
[fʌɪ]
noun
  1. the twenty-first letter of the Greek alphabet (Φ, φ), transliterated as ‘ph’ or (in modern Greek) ‘f’
    希腊字母表中第二十一个字母(译写为ph,现代希腊语中译写为f)
    ■(Phi)[followed by Latin genitive](Astronomy)the twenty-first star in a constellation
    (天文)φ星(星座中第二十一颗星)
    Phi Eridani.
    波江座φ星。
symbol for
  1. ■(φ)a plane angle
    平面角
    ■(φ)a polar coordinate. Often coupled with θ
    极坐标(常与θ成对使用)
语源
  1. Greek
英语宝典
考试词汇表