Medical Definition of venous
1a: full of or characterized by veinsb: made up of or carried on by veins <the venous circulation>
2: of, relating to, or performing the functions of a vein <a venous inflammation> <venous arteries>
3of blood : having passed through the capillaries and given up oxygen for the tissues and become charged with carbon dioxide and ready to pass through the respiratory organs to release its carbon dioxide and renew its oxygen supply : dark red from reduced hemoglobin—compare arterial 2
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