Hematoma after surgery or postoperative hematoma is basically a localized collection of blood at the surgery site. It is defined as the collection or pooling of blood under the skin, in body tissues or an organ. Hematoma is a common potential post-surgery complication, and is commonly seen after a face-lift surgery.ematoma after Surgery. Hematoma is a sac of blood that gets accumulated at a surgical site, after surgery. This accumulation of blood leads to pain, inflammation, and discoloration of the skin around the surgical wound.
noun, plural aircraft. 1. any machine supported for flight in the air by buoyancy or by the dynamic action of air on its surfaces, especially powered airplanes, gliders, and helicopters. Origin of aircraft.
What makes airplanes fly are the four forces of flight, thrust, provided by the engines, propelling the airplane forward, lift pulling the airplane up, drag pulling the airplane back, and weight, or gravity pulling the airplane down. How much an airplane weighs, depends on the plane.