The spleen, especially of an animal bred for food.
(RQ:Flr Mntgn Essay), II.12:
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(nb..).
1983, Robert Nye, The Facts of Life:
Adam Kadmon had pneumonia. Friar Goat cured it by tying a bullock’s milt to the soles of the lad’s feet, and burying the milt afterwards. Adam Kadmon immediately contracted the thrush.