Source : Webster's Revised Unabridged Dictionary (1913)

Resorcin \Res*or"cin\ (r?z-?r"s?n), n. [Resin + orcin. So called
   because in its higher homologue it resembles orcin.] (Chem.)
   A colorless crystalline substance of the phenol series,
   obtained by melting certain resins, as galbanum, asafetida,
   etc., with caustic potash. It is also produced artificially
   and used in making certain dyestuffs, as phthale["i]n,
   fluoresce["i]n, and eosin.