漢：前綴deca-來源于拉丁語，意為"ten",有的書上說來源于希臘語 deka 十。前綴deca-既是一個詞綴也是一個詞根。前綴 dec- / deco- 為 deca- 的變體，一般放在元音字母前。

英：before a vowel, dec-, word-forming element meaning "ten," from Latinized comb. form of Greek deka "ten" (see ten). In the metric system, "multiplied by ten;" while deci- means "divided by ten."

1.decade
n. period of ten years 十年 *deca (=ten)
例句：The anniversary marked a decade in business. 這公司成立10周年紀(jì)念日。

2.Decameron
n. a collection of a hundred tales by Boccaccio 意大利作家薄伽丘著的《十日談》 *deca (=ten),mer<hemer(=day)
例句：Have you ever read Decameron?你讀過《十日談》嗎？

3.decimate
v.kill many people （傳染病等）導(dǎo)致大批死亡 *deci(=ten),mate (=dead)
例句：Locusts decimate hundreds of thousands of acres of crops each year.蝗蟲每年破壞數(shù)千萬英畝的農(nóng)作物。

4.decagon [deca- 十 + gon 角 →]
n. 十角形

5.decagram [deca- 十 + gram 克 →]
n. 十克

6.decameter [deca- 十 + meter 測量，米]
n. 十米

7.decapod [deca- 十 + pod 腳 →“長著十只腳的生物”]
n. 十腳動物