carrier >> /ˈkɛriər/
Definition: [noun] A person or thing that carries, holds, or conveys something.
Example: water carriers
Definition: [noun] A person or company that undertakes the professional conveyance of goods or people.
Example: Pan Am was the third US carrier to cease operations in 1991
Definition: [noun] A person or animal that transmits a disease-causing organism to others. Typically, the carrier suffers no symptoms of the disease.
Example: the black rat, best known as carrier of bubonic plague
Definition: [noun] A substance used to support or convey another substance such as a pigment, catalyst, or radioactive material.
Example: Use caution when using a nitrogen fertilizer as the carrier in mixtures.