From The Collaborative International Dictionary of English v.0.48:

Vap \Vap\ (v[a^]p), n. [See Vapid.]
   That which is vapid, insipid, or lifeless; especially, the
   lifeless part of liquor or wine. [Obs.]
   [1913 Webster]

         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.
   [1913 Webster]
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