1. 矢量;向量
A vector is a variable quantity, such as force, that has size and direction.

2. （传播疾病的）媒介昆虫，带菌生物
A vector is an insect or other organism that causes a disease by carrying a germ or parasite from one person or animal to another.

1. (genetics) a virus or other agent that is used to deliver DNA to a cell

2. a variable quantity that can be resolved into components

3. any agent (person or animal or microorganism) that carries and transmits a disease

e.g. 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

Synonym: transmitter

4. a straight line segment whose length is magnitude and whose orientation in space is direction