Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • prefix In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10−24. Symbol: y

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek ὀκτώ (oktō, "eight"), for the eighth order of 10−3. The letter y was added, as the second term in a series running backwards through the alphabet.

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