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1a person or thing that carries, holds, or conveys something:water carriers 2a person or company that undertakes the professional conveyance of goods or people:Pan Am was the third US carrier to cease operations in 1991 a vessel or vehicle for transporting people or things, especially goods in bulk:the largest timber carrier ever to dock at a Malaysian port a company that provides facilities for conveying telecommunications messages. 3a person or animal that transmits a disease-causing organism to others. Typically, the carrier suffers no symptoms of the disease:the black rat, best known as carrier of bubonic plague a person or other organism that possesses a particular gene, especially as a single copy whose effect is masked by a dominant allele, so that the associated characteristic (such as a hereditary disease) is not displayed but may be passed to offspring. 4a substance used to support or convey another substance such as a pigment, catalyst, or radioactive material. Biochemistry a molecule that transfers a specified molecule or ion within the body, especially across a cell membrane.