Webster's Online Dictionary
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Definition: AMIDOGEN

Part of Speech Definition
Noun 1. A compound radical, NH2, not yet obtained in a separate state, which may be regarded as ammonia from the molecule of which one of its hydrogen atoms has been removed; -- called also the amido group, and in composition represented by the form amido.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Amidogen" was first used in popular English literature: sometime before 1914. (references)

Definition: AMIDOGEN

Part of SpeechDefinition
Noun1. A compound radical, NH2, not yet obtained in a separate state, which may be regarded as ammonia from the molecule of which one of its hydrogen atoms has been removed; -- called also the amido group, and in composition represented by the form amido.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "AMIDOGEN" was first used in popular English literature: sometime before 1914. (references)