Main Entry: tet·ra·cy·cline

Pronunciation: \ˌte-trə-ˈsī-ˌklēn, -klən\

Function: noun

: a yellow crystalline broad-spectrum antibiotic that is produced by a soil actinomycete of the genus Streptomyces (S. viridifaciens) or made synthetically and that is administered chiefly in the form of its hydrochloride C₂₂H₂₄N₂O₈·HCl ; also : any of several chemically related antibiotics (as doxycycline)