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18 points
UROPYGIUMS is validvalid
UROPYGIUM, the hump from which a bird's tail feathers grow [n]
UROPYGIUM, the rump of a bird which supports the tail feathers [n]
UROPYGIUM, the hump from which a bird's tail feathers grow [n]
UROPYGIUM, the rump of a bird which supports the tail feathers [n]