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• PLEXUS LUMBALIS (noun) The noun PLEXUS LUMBALIS has 2 senses: 1. a lymphatic plexus located along the lower portion of the aorta and iliac vessels 2. a plexus of nerves formed by the ventral branches of the first four lumbar nerves Familiarity information: PLEXUS LUMBALIS used as a noun is rare.
