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English Dictionary - With Multi-Lingual Search Definitions hydrogen noun  The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794. Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature. Etymology: From hydrogène, coined by :w:Louis-Bernard Guyton de Morveau, Louis-Bernard Guyton de Morveau.      Full Definition of hydrogen  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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