Having buttocks, or having buttocks of a particular type or size (usually used in compounds like 'full-buttocked').
From 'buttock' (the rounded parts of the rump) plus the adjective-forming suffix '-ed,' suggesting possession of or quality related to buttocks.
This word shows how English anatomists and body-describers needed precise language—you'll find it in historical medical texts and tailoring guides, where precise body descriptions were essential for custom fitting.
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