milt /mɪlt/noun 3verb 1forms 3 noun3 •The semen of a male fish. •The engorged testis containing a filled reservoir of mature spermatozoa in a male fish. •The spleen, especially of an animal bred for food.we see that certaine apprehensions engender a blushing-red colour, others a palenesse; that some imagination doth only worke in the milt, another in the braine[…]. — 1603 verb1 •To impregnate (the roe of a fish) with milt. formsmilted · milting · milts