From The Collaborative International Dictionary of English v.0.48 [gcide]:
Note: Water is used in fresco and in water-color painting, the colors being consolidated with gum arabic; size is used in distemper painting. In oil painting, the fixed oils of linseed, nut, and poppy, are used; in encaustic, wax is the vehicle. --Fairholt.
From WordNet (r) 3.0 (2006) [wn]:
2: a medium for the expression or achievement of something; "his editorials provided a vehicle for his political views"; "a congregation is a vehicle of group identity"; "the play was just a vehicle to display her talents"
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