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Definition of Atomic number 54
1. Noun. A colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts.
Exact synonyms: Xe, Xenon
Generic synonyms: Chemical Element, Element, Argonon, Inert Gas, Noble Gas
Substance meronyms: Air
Generic synonyms: Chemical Element, Element, Argonon, Inert Gas, Noble Gas
Substance meronyms: Air