| 单词 | delta |
| 释义 | delta /del"teuh/, n. 1. the fourth letter of the Greek alphabet. 2. the consonant sound represented by this letter. 3. the fourth in a series of items. 4. anything triangular, like the Greek capital delta. 5. Math. an incremental change in a variable. 6. a nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often, though not necessarily, triangular: the Nile delta. 7. (usually cap.) a word used in communications to represent the letter D. 8. (cap.) Astron. a star that is usually the fourth brightest of a constellation: The fourth brightest star in the Southern Cross is Delta Crucis. [1350-1400; ME deltha < L delta < Gk délta; akin to Heb daleth] |
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