The Collaborative International Dictionary of English v.0.48:

Ripost \Ri*post"\, Riposte \Ri*poste"\, n. [F. riposte.]
   1. In fencing, a return thrust after a parry.
      [1913 Webster]

   2. A quick and sharp refort; a repartee. --J. Morley.
      [1913 Webster]