Source : Webster's Revised Unabridged Dictionary (1913)

Frontignac \Fron`ti*gnac"\, Frontignan \Fron`ti`gnan"\, n. [So
   called from Frontignan, a town in Southern France.]
   1. A sweet muscadine wine made in Frontignan (Languedoc),
      France.

   2. (Bot.) A grape of many varieties and colors.