/ prəˈtruːʒn; NAmE proʊˈt-/ noun
[ C , U ] ( formal ) a thing that sticks out from a place or surface; the fact of doing this :
a protrusion on the rock face
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WORD ORIGIN
early 17th cent. (in the sense thrust something forward or onward ): from Latin protrudere , from pro- forward, out + trudere to thrust.