zepto-


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zep·to- (z),

1. Prefix used in the SI and metric systems to signify submultiples of 10-21.
2. Prefix used in the metric system and SI to signify one sextillionth (10-21).

zepto-

(z)
Prefix used in the SI and metric system to signify 10-21.

zepto-

[Fm L. septem, seven, representing the seventh power of a thousandth]
In the International System of Units (SI), a prefix signifying 10-21.