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English word:    

vector

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vector in WordNet English dictionary

noun
  1. 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"
    vector  transmitter 
  2. (genetics) a virus or other agent that is used to deliver DNA to a cell
    vector 
  3. a variable quantity that can be resolved into components
    vector 
  4. a straight line segment whose length is magnitude and whose orientation in space is direction
    vector 
WordNet Lexical Database v3.0, © 2006 Princeton University