Source : Webster's Revised Unabridged Dictionary (1913)

Milt \Milt\, n. [AS. milte; akin to D. milt, G. milz, OHG.
   milzi, Icel. milti, Dan. milt, Sw. mj["a]lte, and prob. to E.
   malt, melt. [root]108. See {Malt} the grain.] (Anat.)
   The spleen.

Milt \Milt\, n. [Akin to Dan. melk, Sw. mj["o]lke, G. milch, and
   E. milk. See {Milk}.] (Zo["o]l.)
   (a) The spermatic fluid of fishes.
   (b) The testes, or spermaries, of fishes when filled with
       spermatozoa.

Milt \Milt\, v. t.
   To impregnate (the roe of a fish) with milt.

Source : WordNet®

milt
     n 1: fish sperm or sperm-filled reproductive gland; having a
          creamy texture [syn: {soft roe}]
     2: seminal fluid produced by male fish