An old term for vomiting, from casting in the sense of "throwing out or up," as in dice or a fishing line.
from francis bacon's last letter, in which he talks of the effects of stuffing a hen with snow to see if it would slow down rotting, an experiment from which he caught the pneumonia that killed him:
As for the experiment itself, it succeeded excellently well; but in the journey I was taken with such a fit of casting as I know not whether it were the stone, or some surfeit, or cold, or indeed a touch of them all three.