Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
No pronunciation record was provided for this word.
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).
Definition source: English Wiktionary via Wiktextract
Usage: morpheme
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: peta-
History
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-.
Across languages
19 source translations are retained for this English entry.
