Not made from living organisms or their remains; in chemistry, referring to substances that don't contain carbon-hydrogen bonds (with some exceptions).
From in- (meaning not) plus organic, where organic originally meant 'relating to living organisms'; created as chemistry developed to distinguish between substances from living and non-living sources.
The distinction between 'organic' and 'inorganic' chemistry broke down scientifically in the 1800s when chemists synthesized urea (an organic compound) from inorganic chemicals, yet the terms persisted because they're so useful for categorizing—sometimes our words outlive the logic they were built on.
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