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 ( e.g., food, milk, dust, clothing, instrument) by which or upon 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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1) an inert medium in which a medicinally active agent is administered
2) an agent of transmission <a \vehicle of infection>
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n.
(in pharmacy) any substance that acts as the medium in which a drug is administered. Examples are sterile water, isotonic sodium chloride, and dextrose solutions.
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ve·hi·cle (veґĭ-kəl) [L. vehiculum] 1. excipient. 2. a structure for conveyance.Medical dictionary. 2011.