(每日一词）derivative

Derivative /dɪˈrɪvətɪv/ n. 衍生物, 衍生品; 金融衍生产品

Meaning: a form of something, such as a word, made or developed from another form 衍生物, 衍生品

meaning: a financial product such as an option  (=the right to buy or sell something in the future) that has a value based on the value of a mother product, such as shares or bonds 金融衍生产品

1) 前缀: de- 向下

2) 词根: riv-表示river 河流

3) 后缀：-ative 可做名词后缀（-ate + ive 合成 detective)