
In chemistry, amidogen is a radical compound of nitrogen and hydrogen with the formula NH2. A member of the amino group, it may be regarded as an ammonia molecule which has had one of its hydrogen atoms removed. Although amidogen forms part of many compounds, e.g. the phenethylamines, it has not yet been isolated in a separate state. ...
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• (n.) 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.
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http://thinkexist.com/dictionary/meaning/amidogen/
A·mid'o·gen noun [
Amide +
- gen .]
(Chemistry) A compound radical, NH
2 , 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 compos...
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http://www.encyclo.co.uk/webster/A/70

Amidogen is the group NH2. It is known only in combination forming amides with acid radicals, and amines with alkyls. The products are generally known as amido compounds.
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(formerly) the −NH group.
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https://www.infoplease.com/dictionary/amidogen
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