| vasoconstrictor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: pressor, vasoconstrictive |
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| vector | (noun) (genetics) a virus or other agent that is used to deliver DNA to a cell | - |
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| (noun) a variable quantity that can be resolved into components | - |
| (noun) any agent (person or animal or microorganism) that carries and transmits a disease | Synonyms: transmitter |
| (noun) a straight line segment whose length is magnitude and whose orientation in space is direction | - |
| victor | (noun) the contestant who wins the contest | Synonyms: winner |
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| (noun) a combatant who is able to defeat rivals | Synonyms: master, superior |
| victory | (noun) a successful ending of a struggle or contest | Synonyms: triumph |
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