Vehicle

noun
1.
any means in or by which someone travels or something is carried or conveyed; a means of conveyance or transport:
a motor vehicle; space vehicles.
2.
a conveyance moving on wheels, runners, tracks, or the like, as a cart, sled, automobile, or tractor.
3.
a means of transmission or passage:
Air is the vehicle of sound.
4.
a carrier, as of infection.
5.
a medium of communication, expression, or display:
The novel is a fitting vehicle for his talents. Language is the vehicle of thought.
6.
Theater, Movies. a play, screenplay, or the like, having a role suited to the talents of and often written for a specific performer.
7.
a means of accomplishing a purpose:
College is a vehicle for success.
8.
Rhetoric. the thing or idea to which the subject of a metaphor is compared, as “rose” in “she is a rose.”.
Compare tenor (def 3).
9.
Pharmacology. a substance, usually fluid, possessing little or no medicinal action, used as a medium for active remedies.
10.
Painting. a liquid, as oil, in which a pigment is mixed before being applied to a surface.
noun
1.
any conveyance in or by which people or objects are transported, esp one fitted with wheels
2.
a medium for the expression, communication, or achievement of ideas, information, power, etc
3.
(pharmacol) a therapeutically inactive substance mixed with the active ingredient to give bulk to a medicine
4.
Also called base. a painting medium, such as oil, in which pigments are suspended
5.
(in the performing arts) a play, musical composition, etc, that enables a particular performer to display his talents
6.
a rocket excluding its payload

vehicle ve·hi·cle (vē’ĭ-kəl)
n.
A substance of no therapeutic value that is used to convey an active medicine for administration.