ami·​do·​gen | \əˈmēdəjən, -ˌjen\
plural -s

Definition of amidogen 

: the radical NH2 derived from ammonia especially as detected in the free state — compare amido, amino

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First Known Use of amidogen

1838, in the meaning defined above

History and Etymology for amidogen

amid- + -gen

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The first known use of amidogen was in 1838

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the figure or shape of a crescent moon

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