- An excipient or a menstruum; a substance, usually without therapeutic action, used as a medium to give bulk for the administration of medicines.
- An inanimate substance (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]
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Examples: glitazone, GI cocktail, etc.