a fungus (ustilago foetida) which affects the ear of cereals, filling the grains with a fetid dust; -- also called pepperbrand.-the middle part, cavity, or belly of a sail; the part of a furled sail which is at the center of the yard.-to swell out; as, the sail bunts.-to strike or push with the horns or head; to butt; as, the ram bunted the boy.