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Indigen
In general usage the word indigen is treated as a variant of the word indigene, meaning a native.
Wikipedia
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Indigen (noun)
An indigene or native.
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Indigen (noun)
A plant known to be indigenous to a region, rather than a cultigen. from 1918
“cultigen”
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Indogen (noun)
A complex nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo.
Wiktionary