Word Pronunciation & Dictionary

femtosecond

Word Rarity Very rare

Frequency: Zipf frequency 2.10 in modern English

Syllables
fem-tosec-ond
IPA
19
Scrabble Score
11
Letters
3
Syllables
9
Unique Chars

Meaning

noun

An SI unit of time equal to 10⁻¹⁵ seconds. Symbol: fs

Example Sentences

Etymology

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- English second English femtosecond From femto- + second.

Inflected Forms

Derived Forms

Frequently Paired Words

mul:fs

Questions

What does femtosecond mean?
An SI unit of time equal to 10⁻¹⁵ seconds. Symbol: fs
Where does femtosecond come from?
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- English second English femtosecond From femto- + second.

How to pronounce femtosecond

  1. Open the pronunciation page — Open the Speakur entry for “femtosecond”.
  2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
  3. Play the audio — Click Play to hear reference audio for “femtosecond”.
  4. Repeat and practice — Say “femtosecond” aloud, matching stress and vowels until it feels natural.