Originating from or produced outside of something, especially the body or a particular organism; external in origin.
From Greek 'exo-' (outside) and 'genos' (origin, kind), literally meaning 'arising from without.' This scientific term entered English in the 19th century for biological and medical contexts.
Doctors use 'extogenous' to describe infections or toxins that come from outside the body (like food poisoning), while 'endogenous' problems come from inside (like genetic disorders)—this distinction is crucial for treatment because external problems might need environmental fixes while internal ones need biological intervention.
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