delta

delta1
noun
  1. the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’
    希腊字母表中第四个字母（译写为d）
    ■(Brit.)a fourth-class mark given for an essay, examination paper, or other piece of work
    (英)（论文、考试成绩等的）δ等，丁等
    ■[as modifier]the fourth in a series of items, categories, etc
    丁，δ项，δ类 （一系列项目、分类中的第四位）
    delta hepatitis.
    丁型肝炎。
    ■(Delta)[followed by Latin genitive](Astronomy)the fourth (usually fourth-brightest) star in a constellation
    (天文)δ星（星座中第四颗星，通常亮度也居第四位）
    Delta Cephei.
    仙王座δ星。
  2. a code word representing the letter D, used in radio communication
    无线电通讯中字母D的代码词）Δ,δ
symbol for
  1. ■(δ)(Mathematics)variation of a variable or function
    (数)变量
    ■(Δ)(Mathematics)a finite increment
    (数)有限增量
    ■(δ)(Astronomy)declination
    (天文)偏差
语源
  1. Greek, from Phoenician daleth
delta2
noun
  1. a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets
    三角洲
派生
deltaic
adjective
语源
  1. mid 16th cent.: originally specifically as the Delta (of the River Nile), from the shape of the Greek letter (see delta)
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