/dem'euh kloh suy"kleen/, n. Pharm.
a broad-spectrum antibiotic, C21H21ClN2O8, derived from a mutant strain of the bacterium Streptomyces aureofaciens: used against a wide range of susceptible microorganisms.
[contr. and rearrangement of 7-chloro-6-demethyltetracycline, an alternate name]
Useful english dictionary. 2012.