The crossword solution for the term 'Lung or Brain Part' is 'LOBE'. A LOBE is a rounded projection or division of an organ, such as the lungs or brain. The lungs are divided into five lobes, while the brain is divided into four lobes. The lobes of the lungs are the right upper LOBE, right middle LOBE, right lower LOBE, left upper LOBE, and left lower LOBE. The lobes of the brain are the frontal LOBE, parietal LOBE, temporal LOBE, and occipital LOBE.