pro·tru·sion
noun/prəˈtruːʒn/
/prəʊˈtruːʒn/
[countable, uncountable] (formal)- a thing that sticks out from a place or surface; the fact of doing this
突出物；凸起；伸出 - a protrusion on the rock face
岩石表面的突起部分
Word Originearly 17th cent. (in the sense ‘thrust something forward or onward’): from Latin protrudere, from pro- ‘forward, out’ + trudere ‘to thrust’. - a protrusion on the rock face