We found 4 dictionaries that define the word femtometers:

General (2 matching dictionaries)

1. femtometers: Wiktionary
2. Femtometers: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

3. Femtometers: Encyclopedia

Medicine (1 matching dictionary)

4. Femtometers: Medical dictionary

(Note: See femtometer as well.)

Definitions from Wiktionary (Femtometer) ▸ noun:  US spelling of femtometre. [10⁻¹⁵ of a metre. Symbol: fm] ▸ Also see femtometer ▸ Words similar to femtometers ▸ Usage examples for femtometers ▸ Idioms related to femtometers ▸ Wikipedia articles (New!) ▸ Popular adjectives describing femtometers ▸ Words that often appear near femtometers ▸ Rhymes of femtometers ▸ Invented words related to femtometers