An exudate (fluid that oozes out) containing neutrophils that have undergone necrosis in large number; pus.

An exudate is a fluid rich in protein and cellular elements that oozes out of blood vessels due to inflammation and is deposited in nearby tissues.

The altered permeability of blood vessels permits the passage of large molecules and solid matter through their walls. The vessels seem to weep, to "sweat", in keeping with the Latin exsudare, to sweat out, from which exudate is derived.