Definitions for peta-
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Random House Webster's College Dictionary
peta-
a combining form used in the names of units of measure equal to one quadrillion (1015) of a given base unit.
Category: Affix
Origin of peta-:
orig. uncert.
Wiktionary
peta-(Prefix)
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10. Symbol: P
Origin: Based on penta- with the middle letter removed, but the previously coined prefix tera- came from Greek teratos, which means monster.
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