In a gibbose manner; in a way that is swollen, humped, or characterized by irregular bulges.
From 'gibbose' plus the adverbial suffix '-ly'. This creates the adverb form that describes how something exhibits the quality of being gibbose.
The adverb form 'gibbosely' is so specialized and technical that it's almost never used in modern English—you'd probably just say 'with bumps' instead, which shows how some Latinate words are slowly disappearing!
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