The chainsaw is a highly effective and efficient tree and branch cutting power tool. It works with an engine, referred to as a power head; powering a metal chain, driven by a centrifugal clutch, with a chain moving around a groove in the guide bar at fast speeds.
adenoids. 1  one of two masses of lymphatic tissue situated on the posterior wall of the nasopharynx behind the posterior nares. During childhood these masses often swell and block the passage of air from the nasal cavity into the pharynx, preventing the child from breathing through the nose.
The adenoids are located high in the throat behind the nose and soft palate (roof of the mouth) and, unlike tonsils, are not visible through the mouth without special instruments. The tonsils are the two masses of tissue on either side of the back of the throat. Tonsils and adenoids are strategically located near the entrance to the breathing passages where they can catch incoming infections. They 'sample bacteria and viruses and can become infected themselves.