Derriere (noun)

1. The buttocks or the back side of the human body.
2. The back side of anything, such as a building or piece of furniture.

Origin:

From the french word "derrière" meaning "behind", "at the back".

Examples:

1. She had a shapely derriere.
2. The derriere of the sofa was facing the window.
3. He gave her a pat on the derriere.
4. She wore a tight dress that accentuated her derriere.
5. He was admiring the derriere of the statue.