atto-

短语

[医]阿托, 微微微, 百亿亿分之一(10-18)

释义与例句

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  1. 1.

    In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁸ (short scale quintillionth or long scale trillionth).

    阿托

词源

From Danish atten (“eighteen”), with reference to the (negative) exponent in the relevant power of ten; the same principle also explains femto-.

来源：wiktionary