Medical Definition of lumbar vein
: any vein of the four pairs collecting blood from the muscles and integument of the loins, the walls of the abdomen, and adjacent parts and emptying into the dorsal part of the inferior vena cava — see ascending lumbar vein
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“Lumbar vein.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/lumbar%20vein. Accessed 22 Jun. 2021.
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