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We found 9 dictionaries with English definitions that include the word atomic number 18:
Click on the first link on a line below to go directly to a page where "atomic number 18" is defined.

General (8 matching dictionaries)

1. atomic number_18: Vocabulary.com [home, info]
2. atomic number_18: Dictionary.com [home, info]
3. Atomic number 18: Rhymezone [home, info]
4. atomic number_18: Free Dictionary [home, info]
5. atomic number_18: Mnemonic Dictionary [home, info]
6. atomic number_18: WordNet 1.7 Vocabulary Helper [home, info]
7. atomic number_18: LookWAYup Translating Dictionary/Thesaurus [home, info]
8. atomic number_18: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

9. atomic number_18: Encyclopedia [home, info]

Quick definitions from WordNet (Atomic number 18) ▸ noun:  a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere ▸ Words similar to atomic number 18 ▸ Usage examples for atomic number 18 ▸ Idioms related to atomic number 18 (New!) ▸ Words that often appear near atomic number 18 ▸ Rhymes of atomic number 18 ▸ Invented words related to atomic number 18