Definition of protrusion in US English:

protrusion

noun

  • Something that protrudes; a protuberance.

    ‘a protrusion of rock jutted from the mountainside’
    • ‘Despite its age, the walls were already pitted and scorched, the ceiling covered with small bumps and protrusions.’
    • ‘Follow routes on protrusions and ridges, and always ski slow and conservative.’
    • ‘They are coated with distinctive bumps and small protrusions against an overall veiled surface.’
    • ‘The concrete path is studded with local river rocks of varying sizes, from pointy pebbles to smooth skipping stones to softball-sized protrusions.’
    • ‘With a typical hernia, there is a bulge resulting from the protrusion of an internal organ.’
    bump, lump, knob, hump, jut, projection, prominence, protuberance, overhang, eminence, ledge, shelf, ridge
    sticking out, jutting, projection, projecting, obtrusion, obtruding, prominence, protuberance
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Pronunciation

protrusion

/prəˈtro͞oZHən//prəˈtruʒən/