WordNet (r) 3.0 (2006):
lumbar plexus n 1: a lymphatic plexus located along the lower portion of the aorta and iliac vessels [syn: lumbar plexus, plexus lumbalis] 2: a plexus of nerves formed by the ventral branches of the first four lumbar nerves [syn: lumbar plexus, plexus lumbalis]