duct 
/ˈdʌkt/ noun
plural ducts /ˈdʌkt/ noun [count] 1 : a pipe or tube for air, water, electric power lines, etc., to pass through
▪ a building's air/heating/ventilation ducts 2 : a tube in the body that carries a particular liquid
▪ tear ducts ▪ the bile duct
▪ a building's air/heating/ventilation ducts
▪ tear ducts ▪ the bile duct
