The Collaborative International Dictionary of English v.0.48:

Gleet \Gleet\, n. [OE. glette, glet, glat, mucus, pus, filth,
   OF. glete.] (Med.)
   A transparent mucous discharge from the membrane of the
   urethra, commonly an effect of gonorrhea. --Hoblyn.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gleet \Gleet\, v. i.
   1. To flow in a thin, limpid humor; to ooze, as gleet.
      --Wiseman.
      [1913 Webster]

   2. To flow slowly, as water. --Cheyne.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gleet
    n 1: a thin morbid discharge as from a wound or especially
         chronic gonorrhea