vector

(n) a variable quantity that can be resolved into components
(n) a straight line segment whose length is magnitude and whose orientation in space is direction
(n) any agent (person or animal or microorganism) that carries and transmits a disease
- mosquitos are vectors of malaria and yellow fever
- fleas are vectors of the plague
- aphids are transmitters of plant diseases
- when medical scientists talk about vectors they are usually talking about insects
transmitter,
(n) (genetics) a virus or other agent that is used to deliver DNA to a cell

transmitter

vector algebra vector-borne transmission vector decomposition vector product vector sum