delta: [16] Delta was the fourth letter of the Greek alphabet, corresponding to English d. Its capital form was written in the shape of a tall triangle, and already in the ancient world the word was being applied metaphorically to the triangular deposit of sand, mud, etc which forms at the mouth of rivers (the Greek historian Herodotus, for instance, used it with reference to the mouth of the Nile). Greek acquired the word itself from some Semitic language; it is related to dāleth, the name of the fourth letter of the Hebrew alphabet.
delta (n.)
c. 1200, Greek letter shaped like a triangle, equivalent to our "D," the name from Phoenician daleth "tent door." Herodotus used it of the mouth of the Nile, and it was so used in English from 1550s; applied to other river mouths from 1790.
实用例句
1. The less stable compounds were converted into a compound called Delta-A THC.
不太稳定的化合物被转换成了一种叫做Delta-ATHC的化合物。
来自柯林斯例句
2. A Delta II rocket was launched from Cape Canaveral early this morning.
今天一早，一枚“德尔塔”Ⅱ型火箭在卡纳维拉尔角发射升空。
来自柯林斯例句
3. Delta is the fourth letter of the Greek alphabet.
δ是希腊字母中的第四个字母.
来自《简明英汉词典》
4. The Nile divides at its mouth and forms a delta.
尼罗河在河口分岔,形成了一个三角洲.
来自《现代汉英综合大词典》
5. The singularities and inverse kinematic solution of the DELTA robot are discussed.