• WordNet 3.6
    • n gibbosity something that bulges out or is protuberant or projects from its surroundings "the gun in his pocket made an obvious bulge","the hump of a camel","he stood on the rocky prominence","the occipital protuberance was well developed","the bony excrescence between its horns"
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Century Dictionary and Cyclopedia
    • n gibbosity The state of being gibbous or gibbose; roundness or protuberance of outline; convexity.
    • n gibbosity A protuberance; a round or swelling prominence. Specifically
    • n gibbosity In botany, a swelling or protuberance at one side of an organ, usually near the base, as of a calyx.
    • n gibbosity In zoology, an irregular large protuberance, somewhat rounded, but not forming the segment of a sphere; a hump: as, the gibbosity of or on the back of a camel or zebu.
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In literature:

The whorls are posteriorly gibbose or tumid at the sutures, and the callus is less spreading than in others of the genus.
"Explorations in Australia, The Journals of John McDouall Stuart" by John McDouall Stuart
Behind the neck and immediately above the shoulder rises a gibbosity or hump of the same height as the dorsal ridge.
"Natural History of the Mammalia of India and Ceylon" by Robert A. Sterndale
For my gibbosities tickled the taste of a travelling mountebank.
"The Proud Prince" by Justin Huntly McCarthy