Word.ws English Dictionary

femto-

femto- prefix: 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).

Prefix

femto-

  1. 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).
    Antonyms:
    peta-

femto- meaning in Vietnamese

femto- in Vietnamese

prefix
fem-tô, phem-tô

Antonyms of femto-

Origin of femto-

From Danish femten (“fifteen”), with reference to the (negative) exponent in the relevant power of ten; the same principle also explains atto-.

Questions about femto-

What does femto- mean?
Femto- means 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).
What is femto- in Vietnamese?
Femto- in Vietnamese is fem-tô, phem-tô. See Femto- meaning in Vietnamese.
What part of speech is femto-?
Femto- is a prefix.

Words near femto- in the dictionary

  1. femsymp
  2. femsymps
  3. femtard
  4. femtards
  5. femtech
  6. femto-
  7. femto-photography
  8. femtoampere
  9. femtoamperes
  10. femtobarn
  11. femtobarns

Source and license

Adapted from Wiktionary: femto- (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “femto-.” Word.ws, https://word.ws/femto-. Based on Wiktionary, CC BY-SA 4.0.