from Wiktionary, Creative Commons Attribution/Share-Alike License.
- prefix In the
International System of Unitsand other metricsystems of units, multiplying the unitto which it is attached by 10−21. Symbol: z
from Wiktionary, Creative Commons Attribution/Share-Alike License
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.
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