femto-
prefix
Meaning
- In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁵ (short scale quadrillionth or long scale billiardth).
Etymology / origin
Etymology tree Proto-Indo-European *pénkʷe Proto-Germanic *fimf Proto-Indo-European *déḱm̥ Proto-Germanic *tehun Proto-Germanic *fimftehun Old Norse fimmtánder. Danish femtender. English femto- From Danish femten (“fifteen”), with reference to the (negative) exponent in the relevant power of ten; the same principle also explains atto-.
- femten(Danish)→
- femto- (English)
- Relations: der
Related words
Descendant words
- femto-(Finnish) (cog)
- femto-(Indonesian) (der)
Sources
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