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.
例文
1. The less stable compounds were converted into a compound called Delta ?A THC.不安定な化合物が Delta ?ATHCという化合物に変換された。
2.A Delta II rocket was launched from Cape Canaveral early this morning.
今朝、カナベラルの角に「デルタ」II型ロケットが打ち上げられた。
3. Delta is the fourth letter of the Greek alphabet.
δはギリシャ文字の4番目の文字である。
4.The Nile divides at its mouth and forms a delta .
ナイル川は河口で分岐し、デルタを形成している。
5.The singularities and inverse kinematic solution of the DELTA robot are discused.