(n) :
(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.
(n) :
(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.