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Definition of protrusion:

  1. The act of thrusting forward beyond the usual limit; a push.

Synonyms:

gibbosity, prominence, bunch, knot, prominent, overhang, lump, protuberant, swelling, bulging, study at projection, hump, acoustic projection, limb, intumescence, excrescence, extrusion, project, protuberance, forcing out, jutting, ejection, intumescency, blow, swell, gibbousness, expulsion, flap, point, stick out, projection, knob, bump, sound projection, ridge, jut, puffiness, convex, protrude, arm, snout, stick up, bulge.