Comparative form meaning more gibberose; more humpbacked or humped in appearance.
From 'gibbose' or 'gibberose' with the English comparative suffix '-er,' creating a comparative adjective to compare degrees of humpedness.
Words like 'gibbier' are technical anatomical terms that show how English can build comparative forms from almost any descriptive word, but they're so specialized that most native speakers have never encountered them!
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