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 tonsils are two pads of lymphatic tissue located on each side of the back of the throat. The adenoids are a pad of lymphatic tissue high in the throat behind the nose and the roof of the mouth and look like tiny clusters of grapes. Adenoids are also called pharyngeal tonsils, but they are separate from the tonsils in the throat. The adenoids cannot be seen by looking into the mouth. Lymphatic tissue is found throughout the body and is important in the bodyâs defense against infection.