the fourth letter of the Greek alphabet (Δ, δ) 希腊字母表的第 4 个字母 an area of land, like a triangle in shape, where a river has split into several smaller rivers before entering the sea 三角洲 the Nile Delta 尼罗河三角洲
Word Originsense 1 Greek, from Phoenician daleth.sense 2 mid 16th cent.: originally specifically as the Delta (of the River Nile), from the shape of the Greek letter.