This does not appear to be a recognized English word in standard dictionaries.
If it exists in specialized technical or scientific contexts, it might derive from 'automat' + '-in' (a suffix used in chemistry for proteins and compounds), but no established etymology or definition appears in major English references.
Scientific fields love adding '-in' to create new technical terms (like 'insulin' or 'melanin'), so someone might invent 'automatin' in a lab, but until many scientists use it consistently, it remains a word waiting to be born.
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