Vehicle Ve"hi*cle, n. [L. vehiculum, fr. vehere to carry; akin to E. way, wain. See Way, n., and cf. Convex, Inveigh, Veil, Vex.] 1. That in or on which any person or thing is, or may be, carried, as a coach, carriage, wagon, cart, car, sleigh, bicycle, etc.; a means of conveyance; specifically, a means of conveyance upon land. 2. That which is used as the instrument of conveyance or communication; as, matter is the vehicle of energy. A simple style forms the best vehicle of thought to a popular assembly. --Wirt. 3. (Pharm.) A substance in which medicine is taken. 4. (Paint.) Any liquid with which a pigment is applied, including whatever gum, wax, or glutinous or adhesive substance is combined with it. 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., Vehicle Ve"hi*cle, n. (Chem.) A liquid used to spread sensitive salts upon glass and paper for use in photography.