Mixed or tinged with blood.
from The American Heritage® Dictionary of the English Language, 4th Edition
A grandiloquence that sways uneasily between rodomontade and mere verbiage, a rotundity of diction, a choice of subjects which can only be described as sanguinolent, the use of the bludgeon where others would prefer a rapier.
Dysentery is a flux of the bowels with a sanguinolent discharge and excoriation of the intestines.
Diarrhoea is a simple flux of the bowels, without either the sanguinolent discharges or the intestinal excoriation.
Now this is actually so: in some the auricle presents itself as a sanguinolent vesicle, as a thin membrane containing blood, as in fishes, in which the sac that stands in lieu of the auricles is of such delicacy and ample capacity that it seems to be suspended or to float above the heart.
The intestinal contents in such cases were not colorless, but consisted of a sanguinolent, ichorous, putrid fluid.