Source : Webster's Revised Unabridged Dictionary (1913)

Pathogene \Path"o*gene\, n. [See {Pathogenic}.] (Biol.)
   One of a class of virulent micro["o]rganisms or bacteria
   found in the tissues and fluids in infectious diseases, and
   supposed to be the cause of the disease; a pathogenic
   organism; a pathogenic bacterium; -- opposed to zymogene.