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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. Taylor. [1913 Webster]