projection

projection, protrusion, protuberance, bulge all denote something which extends beyond a level or a normal outer surface.

Projection is applicable to anything that juts out, especially at a sharp angle

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buttresses are projections which serve to support a wall or a building at a point of great strain or pressure

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machinery set in motion to keep a level smooth . . . feels the least projection, and tries to flatten it out— Hearn

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the appendix is a small ñngerlike projection from the large bowel— Fishbein

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Protrusion applies to something which is thrust out or which pushes out so that it seems an excrescence or deformity

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a protrusion of lava in the form of a thousand- foot pinnacle

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the fantastic gables, pinnacles, and protrusions which intercepted the light— Samuel Lucas

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A protuberance swells or pushes out, often in rounded rather than angular form

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warty protuberances on a potato

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balconies, bay windows and protuberances which make their fronts look like bemedaled chests— Hauser

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A bulge is a protuberance or expansion of a surface caused usually by pressure from within or below

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a bulge in a wall

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there is a slight bulge in the soil before the first stalk of a plant appears

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