We found 7 dictionaries that define the word atomic number 4:

General (6 matching dictionaries)

1. atomic number 4: Vocabulary.com
2. atomic number 4: Dictionary.com
3. Atomic number 4: Rhymezone
4. atomic number 4: FreeDictionary.org
5. atomic number 4: Mnemonic Dictionary
6. atomic number 4: TheFreeDictionary.com

Computing (1 matching dictionary)

7. atomic number 4: Encyclopedia

Definitions from WordNet (Atomic number 4) ▸ noun:  a light strong brittle gray toxic bivalent metallic element Opposite: element number 6, carbon ▸ Words similar to atomic number 4 ▸ Usage examples for atomic number 4 ▸ Idioms related to atomic number 4 ▸ Wikipedia articles (New!) ▸ Words that often appear near atomic number 4 ▸ Rhymes of atomic number 4 ▸ Invented words related to atomic number 4