Frontal is an adjective that can refer to several things. It may refer to the bone of the forehead; the forehead is the part of the skull between the eyebrows and the top of the skull. The frontal bone is a single skull bone. The frontal part of a structure is located in front of another part. In medicine, there is also frontal lobe disorder which refers to the set of symptoms appearing in cases of injury to the frontal lobe of the brain that often appears as psychological problems, disorientation, and a fluctuating mood.