Definition of venous adjective from the Oxford Advanced Learner's Dictionary

 

venous

 adjective
adjective
BrE BrE//ˈviːnəs//
 
; NAmE NAmE//ˈviːnəs//
 
(specialist)
 
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of or contained in veins (= the tubes that carry liquids around the bodies of animals and plants) venous blood Word Origin early 17th cent.: from Latin venosus ‘having many veins’, from vena ‘vein’.
See the Oxford Advanced American Dictionary entry: venous