Something that bulges out or is protuberant or projects from its surroundings:
— The occipital protuberance was well developed.

synonyms: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, swelling ... show more.

Roget 250: convexity, prominence, projection, swelling, gibbosity^†, bilge, bulge, protuberance, protrusion; camber, cahot [U.S.].    thank-ye-ma'am [U.S.].    swell.    intumescence; tumour [Brit.], tumor; tubercle, tuberosity [Anat.]; excrescence; hump, hunch, bunch.    boss, embossment, hub, hubble; [convex body parts] tooth [U.S.], knob, elbow, process, apophysis^†, condyle, bulb, node, nodule, nodosity^†, tongue, dorsum, bump, clump; sugar loaf etc. (sharpness) 253; bow; mamelon^†; molar; belly, corporation^†, pot belly, gut [Coll.]; withers, back, shoulder, lip, flange.    [convexities on skin] pimple, zit [Slang]; wen, wheel, papula [Med.], pustule, pock, proud flesh, growth, sarcoma, caruncle^†, corn, wart, pappiloma, furuncle, polypus^†, fungus, fungosity^†, exostosis^†, bleb, blister, blain^†; boil etc. (disease) 655; airbubble^†, blob, papule, verruca.    [convex body parts on chest] papilla, nipple, teat, tit [Vulg.], titty [Vulg.], boob [Vulg.], knocker [Vulg.], pap, breast, dug, mammilla^†.    [prominent convexity on the face] proboscis, nose, neb, beak, snout, nozzle, schnoz [Coll.].    peg, button, stud, ridge, rib, jutty, trunnion, snag.    cupola, dome, arch, balcony, eaves; pilaster.    relief, relievo [It], cameo; bassorilievo^†, mezzorilevo^†, altorivievo; low relief, bas relief [Fr.], high relief.    hill etc. (height) 206; cape, promontory, mull; forehead, foreland^†; point of land, mole, jetty, hummock, ledge, spur; naze^†, ness.    ... show more

Dutch: bult, extrusie, buik, hobbel

The condition of being protuberant; the condition of bulging out.