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proton synchrotron
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protrusion

pro·tru·sion [ prō tr'n ] (plural pro·tru·sions)


noun 
Definition:
 
1. something that protrudes: something that sticks out from its surroundings

2. act of protruding: the act of protruding, or the state of being protruded

[Mid-17th century. < medieval Latin protrusion-< Latin protrus-, past participle of protrudere (see protrude)]
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