directional test

a statistical test of a directional hypothesis. Also called directional alternative hypothesis test; directional hypothesis test; one-tailed test. Compare nondirectional test.

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Psychology term of the day

January 29th 2025

vasoconstrictor

n. any drug or other agent (e.g., the hormone vasopressin) that causes constriction of blood vessels so that the diameter of the vessels is reduced. The vasomotor nerves of the sympathetic nervous system also serve as vasoconstrictors. Vasoconstrictor drugs are used to increase blood pressure that has fallen to dangerously low levels. Also called vasopressor.