milt

[milt] /mɪlt/
noun
1.
the sperm-containing secretion of the testes of fishes.
2.
the testes and sperm ducts when filled with this secretion.
3.
melt2 .
Origin
before 900; Middle English milte, milt, Old English milte spleen; cognate with German Milz, Middle Dutch milte milt, spleen; akin to melt2
British Dictionary definitions for milt

milt

/mɪlt/
noun
1.
the testis of a fish
2.
the spermatozoa and seminal fluid produced by a fish
3.
(rare) the spleen of certain animals, esp fowls and pigs
verb
4.
to fertilize (the roe of a female fish) with milt, esp artificially
Word Origin
Old English milte spleen; in the sense: fish sperm, probably from Middle Dutch milte
Word Origin and History for milt
n.

Old English milte "spleen," from Proto-Germanic *miltjo- (cf. Old Frisian milte, Middle Dutch milte, Dutch milt "spleen, milt of fish," Old High German milzi, German milz, Old Norse milti). Meaning "fish sperm" is late 15c.

milt in Science
milt
  (mĭlt)   
Fish sperm, together with the milky liquid that contains them.