zepto-

Greek (h)epta- (seven), for the seventh order of 10⁻³. The final o conforms to the finals vowel of the SI series from micro- downwards; the letter z was added, as a start in a series of terms running backwards through the alphabet.

zepto-

1. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻²¹. Symbol: z

• zetta-

From Ancient Greek ἑπτά (heptá, “seven”), for the seventh order of 10⁻³. The final o conforms to the finals vowel of the SI series from micro- downwards; the letter z was added, as a start in a series of terms running backwards through the alphabet.

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zepto-

1. zepto-