venous Syllabification: (ve·nous)Pronunciation: /ˈvēnəs/Definition of venous adjective of or relating to a vein or the veins. of or relating to the dark red, oxygen-poor blood in the veins and pulmonary artery. Derivatives venosityPronunciation: /viˈnäsətē/ noun venously adverb Origin: early 17th century: from Latin venosus 'venous', from vena 'vein'venous in other Oxford dictionaries Definition of venous in the British & World English dictionary