来源于西班牙语pico 意为"a little over, a small balance,"，直到1952年才正式被采用，作为科学前缀，意思是“万亿分之一”。

另外，femto- 表示“毫微微,尘”，atto- 表示“微微微,渺”

英文词源：word-forming element used in making names for very small unites of measure, 1915 (formally adopted c.1952 as a scientific prefix meaning "one trillionth"), from Spanish pico "a little over, a small balance," literally "sharp point, beak," of Celtic origin (compare Gaulish beccus "beak").

同缀词：

1.picohenry [pic- 前缀表示微微,万亿分之一,沙 + henry 电感单位亨利]
n.微微亨

2.picofarad [pic- 前缀表示微微,万亿分之一,沙 + farad n. 法拉（电容单位）]
n.微微法

3.picosecond [[pic- 前缀表示微微,万亿分之一,沙 + second 秒]
n.微微秒

4.picoprogram [[pic- 前缀表示微微,万亿分之一,沙 + program 程序]
n. 微微程序