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Noun protrusion has 2 senses
  1. bulge, bump, hump, gibbosity, gibbousness, jut, prominence, protuberance, protrusion, extrusion, excrescence - something that bulges out or is protuberant or projects from a form
    --1 is a kind of projection
    --1 has particulars:
     frontal eminence; occipital protuberance; belly; caput; mogul; nub, nubble; snag; wart
    Derived forms: verb protrude2, verb protrude3
  2. protrusion, projection, jut, jutting - the act of projecting out from something
    --2 is a kind of change of shape
    Derived form: verb protrude1
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