n.[C]

1. （河口的）三角洲
   the Nile Delta

   尼羅河三角洲

2. 希臘語的第四個字母
3. 三角形之物

a.

1. 【化】第四位的

n.

1. the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’.
   ▸ [as modifier] denoting the fourth in a series of items or categories.
   ▸Brit. a fourth-class mark given for a piece of work.
2. a code word representing the letter D, used in radio communication.

symb.

n.