Collins Concise English Dictionary © HarperCollins Publishers::

derrière /ˌdɛrɪˈɛə; French: dɛrjɛr/ n
  1. euphemistic the buttocks
Etymology: 18th Century: literally: behind (prep), from Old French deriere, from Latin dē retrō from the back

'derriere' also found in these entries:
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