Medical Definition of tetanus
1a: an acute infectious disease characterized by tonic spasm of voluntary muscles and especially of the muscles of the jaw and caused by an exotoxin produced by a bacterium of the genus Clostridium (C. tetani) which is usually introduced through a wound—compare lockjawb: tetanus bacillus
2: prolonged contraction of a muscle resulting from a series of motor impulses following one another too rapidly to permit intervening relaxation of the muscle
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