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English Dictionary - With Multi-Lingual Search Definitions oxygen noun  A chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. An atom of this element. Molecular oxygen (O2), a colorless, odorless gas at room temperature. (medicine) A mixture of oxygen and other gases, administered to a patient to help him or her to breathe. Etymology: Borrowed from oxygène (originally in the form principe oxygène, a variant of principe oxigine "acidifying principle", suggested by w:Lavoisier, Lavoisier), from Ancient Greek (polytonic, á) (oxus) sharp + (polytonic, ) (genos) birth, referring to oxygen's role in the formation of acids.      Full Definition of oxygen  Find:   Words Starting With:   Words Ending With:   Words Containing:   Words That Match:    Translate Into:    Dutch   French   German    Italian   Spanish     Show 51015202550 results per page. Enter your search terms Submit search form   Web www.allwords.com Browse the Dictionary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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