Boar hair refers to the bristles or hair that comes from a boar, which is a kind of wild pig. It is often used in brushes or grooming tools for things like hair, beards, or even cleaning. Full definition
The good thing about boar hair brushes is that they're cheap — sometimes less than $ 5. (primandprep.com)
Omega makes one of the most popular boar hair shaving brushes. (hespokestyle.com)
Even better: the combination of nylon pins and real boar hair bristles means your hair can be held and smoothed, with the boar bristles helping to distribute natural oils from the scalp. (geekwrapped.com)