The quality or state of being gibbose; the condition of having swelling, humps, or irregular bulges.
From 'gibbose' plus the noun-forming suffix '-ness'. This creates an abstract noun describing the characteristic of being gibbose in appearance or structure.
English loves converting adjectives to abstract nouns with '-ness'—sadness, happiness, gibboseness—it's one of our most productive word-building patterns, which is why English can describe almost any quality or state!
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