Worse, the meaning of ‘fixed oils’ appears ambiguous. If you look at the use of the term in different contexts, some take it to be non-volatile
oils, others define it as non-essential, with 'essential' itself having different meanings in different contexts. In perfumery, the essential oils are
the fraction of oils that contain the characteristic fragrance of the plant from which they were extracted. In metabolism, essential oils are those
that contain the fatty acids an organism can't synthesize itself but needs to take in from external sources.
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