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yocto- (y-),

Prefix used in the metric system and SI to signify one septillionth (10-24).
[y- + L. octo, eight (yocto- being 8th in the series of SI submultiple prefixes)]
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[Fm. octo-, representing the eighth power of a thousandth],


In the International System of Units (SI), a prefix signifying 10-24.
Medical Dictionary, © 2009 Farlex and Partners