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Answer for the clue "Decrease in the diameter of blood vessels ", 16 letters:
vasoconstriction

Word definitions for vasoconstriction in dictionaries

Wikipedia Word definitions in Wikipedia
Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, in particular the large arteries and small arterioles . The process is the opposite of vasodilation , the widening of blood vessels. The ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1899, from comb. form of vas + constriction .

WordNet Word definitions in WordNet
n. decrease in the diameter of blood vessels

Wiktionary Word definitions in Wiktionary
n. constriction of a blood vessel

Usage examples of vasoconstriction.

He explained about vasoconstriction of the coronary vessels, something like that brought about by a lifetime of gorging on butter, or a thrombosis.

The vasoconstriction called gooseflesh meant his skin had begun sealing itself tighter to keep body heat in, stop blood flow to his periphery, where heat evaporated faster, and preserve it around his core organs.