femto-
combining form /femtəʊ/
  /femtəʊ/
(specialist)- (in units of measurement) 10-15
- a femtosecond
 
Word Originfrom Danish or Norwegian femten ‘fifteen’. 
| 单词 | femto- | 
| 释义 | femto-combining form /femtəʊ/   /femtəʊ/ (specialist)
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