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Definition of Atto-
1. Prefix. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10?18. Symbol: a ¹
¹ Source: wiktionary.com
Medical Definition of Atto-
1.
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1. Prefix. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10?18. Symbol: a ¹
¹ Source: wiktionary.com
1.