Definitions of Oidium

  1. In bot., a parasitic fungus or mould, consisting of minute interlacing filaments, and covering a surface as if with a white down; a mould or mildew affecting the grape. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  2. The conidial stage of some of the mildews. A dictionary of scientific terms. By Henderson, I. F.; Henderson, W. D. Published 1920.