\Vap\ (v[a^]p), n. [See {Vapid}.]
That which is vapid, insipid, or lifeless; especially, the
lifeless part of liquor or wine. [Obs.]
      In vain it is to wash a goblet, if you mean to put into
      it nothing but the dead lees and vap of wine. --Jer.
                                               Taylor.