pyg(o)-
The buttocks.
[Greek pugē, rump.]
A pygidium is the terminal part or hind segment of the body in certain invertebrates; a pygostyle (Greek stulos, column) in a bird is a triangular plate, typically supporting the tail feathers; pygopagus (Greek pagos, fixed) refers to a pair of Siamese twins joined at the buttocks, often back to back.
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