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/ˈfjʊə.ɹæn/ · noun
(organic chemistry) Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms, two double bonds and an oxygen atom; especially the simplest one, C₄H₄O..
Use furan when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Furan means (organic chemistry) Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms, two double bonds and an oxygen atom; especially the simplest one, C₄H₄O..
Common synonyms include furfuran, furane.
The opposite depends on the specific sense.
Use furan where its definition matches the intended context.
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