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We found 27 dictionaries with English definitions that include the word mass number:
Click on the first link on a line below to go directly to a page where "mass number" is defined.

General (17 matching dictionaries)

1. mass number: Merriam-Webster.com [home, info]
2. mass number: Oxford Dictionaries [home, info]
3. mass number: American Heritage Dictionary of the English Language [home, info]
4. mass number: Collins English Dictionary [home, info]
5. mass number: Vocabulary.com [home, info]
6. mass number: Wiktionary [home, info]
7. mass number: The Wordsmyth English Dictionary-Thesaurus [home, info]
8. mass number: Infoplease Dictionary [home, info]
9. mass number: Dictionary.com [home, info]
10. mass number: UltraLingua English Dictionary [home, info]
11. Mass number: Wikipedia, the Free Encyclopedia [home, info]
12. mass number: Rhymezone [home, info]
13. mass number: Free Dictionary [home, info]
14. mass number: Mnemonic Dictionary [home, info]
15. mass number: WordNet 1.7 Vocabulary Helper [home, info]
16. mass number: LookWAYup Translating Dictionary/Thesaurus [home, info]
17. mass number: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

18. mass number: Legal dictionary [home, info]

Computing (1 matching dictionary)

19. mass number: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

20. mass number: online medical dictionary [home, info]
21. mass number: Medical dictionary [home, info]

Science (5 matching dictionaries)

22. Mass Number: Chemistry Dictionary [home, info]
23. Mass Number: Extragalactic Astronomy [home, info]
24. mass number: General Chemistry Online [home, info]
25. Mass number: NRC Glossary of Nuclear Terms -- [home, info]
26. mass number: UNCChem Glossary [home, info]

Tech (1 matching dictionary)

27. Mass Number: Explosives [home, info]

(Note: See mass_numbers for more definitions.)

Quick definitions from WordNet (mass number) ▸ noun:  the sum of the number of neutrons and protons in an atomic nucleus ▸ Also see mass_numbers ▸ Words similar to mass number ▸ Usage examples for mass number ▸ Words that often appear near mass number ▸ Rhymes of mass number ▸ Invented words related to mass number