We found 14 dictionaries that define the word femtometer:

General (10 matching dictionaries)

1. femtometer: Merriam-Webster
2. femtometer: Vocabulary.com
3. femtometer: Wiktionary
4. femtometer: Infoplease Dictionary
5. femtometer: Dictionary.com
6. Femtometer: Wikipedia, the Free Encyclopedia
7. femtometer: Rhymezone
8. femtometer: FreeDictionary.org
9. femtometer: Mnemonic Dictionary
10. femtometer: TheFreeDictionary.com

Computing (1 matching dictionary)

11. femtometer: Encyclopedia

Medicine (1 matching dictionary)

12. femtometer: Medical dictionary

Science (1 matching dictionary)

13. Femtometer: Eric Weisstein's World of Physics

Tech (1 matching dictionary)

14. Basics of Space Flight Glossary (No longer online)

(Note: See femtometers as well.)

Definitions from Wiktionary (Femtometer) ▸ noun:  US spelling of femtometre. [10⁻¹⁵ of a metre. Symbol: fm] Similar: femtometre, fermi, terameter, zeptometer, hectometer, yoctometer, tenthmetre, zettameter, petameter, gigameter, more... ▸ Words similar to femtometer ▸ Usage examples for femtometer ▸ Idioms related to femtometer ▸ Wikipedia articles (New!) ▸ Popular adjectives describing femtometer ▸ Words that often appear near femtometer ▸ Rhymes of femtometer ▸ Invented words related to femtometer