2. any medium through which an impulse is propagated.
1. An excipient or a menstruum; a substance, usually without therapeutic action, used as a medium to give bulk for the administration of medicines.
2. An inanimate substance (for example, food, milk, dust, clothing, instrument) by which or on which an infectious agent passes from an infected to a susceptible host; vehicles consequently act as important sources of infection.
[L. vehiculum, a conveyance, fr. veho, to carry]
An inactive substance that is combined with an active medication to facilitate administration.
Epidemiology An inanimate intermediate in the indirect transmission of a pathogen from a reservoir or infected host to a susceptible host; vehicles include foods, clothing, instruments. Cf Vector Pharmacology An inert carrier or excipient for a therapeutic agent–eg, water, alcohol-containing elixirs or a sweetened syrup, which provides bulk or