• WordNet 3.6
    • n vasoconstrictor 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
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Webster's Revised Unabridged Dictionary
    • a Vasoconstrictor (Physiol) Causing constriction of the blood vessels; as, the vasoconstrictor nerves, stimulation of which causes constriction of the blood vessels to which they go. These nerves are also called vasohypertonic.
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Century Dictionary and Cyclopedia
    • vasoconstrictor Serving to constrict vessels when stimulated, as certain nerves: opposed to vasodilator. Both are included under vasomotor.
    • n vasoconstrictor That which causes contraction of the blood-vessels: applied to nerves and to certain drugs.
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In literature:

The tone of the vasoconstrictor center controls the distribution of blood throughout the body.
"Arteriosclerosis and Hypertension:" by Louis Marshall Warfield

In news:

IntroductionLocal anesthetics with vasoconstrictors are frequently used drugs.