from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sudden constriction of a blood vessel, causing a reduction in blood flow.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Spasm of the blood vessels, leading to vasoconstriction and potentially tissue ischemia and necrosis.
from The Century Dictionary and Cyclopedia
- n. Spasmodic contraction of the blood-vessels.
vaso- + spasm (Wiktionary)