Leg pain is also frequently a sign of injury, such as the following: Muscle strain is a common injury that happens when the muscle fibers tear as a result of overstretching. It often occurs in the larger muscles, such as the hamstrings, calves, or quadriceps.
medical Definition of superinfection : a second infection superimposed on an earlier one especially by a different microbial agent of exogenous or endogenous origin that is resistant to the treatment used against the first infection
1 enatation - Escape by swimming. 2  butterfly stroke - In swimming, the stroke in which both arms are raised out of the water and lifted forward together. 3  shoal - A synonym for school, referring to a large number of fish swimming together.  supernatant - Means swimming on the surface..