Medical Dictionary
152 ENTRIES FOUND:

vein

noun \ˈvān\

Definition of VEIN

:  any of the tubular branching vessels that carry blood from the capillaries toward the heart and have thinner walls than the arteries and often valves at intervals to prevent reflux of the blood which flows in a steady stream and is in most cases dark-colored due to the presence of reduced hemoglobin

Illustration of VEIN

April 01, 2015
diapause Hear it
a period of physiological dormancy
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