n.
  - a tube or passageway in a building or machine for air, cables, etc.
 - a vessel in the body for conveying lymph or glandular secretions. 
▸a vessel in a plant for conveying water, sap, or air.
 
v.
 convey through a duct.
 
  Derivative
  
  Etymology
  C17 (in the sense ‘course’ or ‘direction’): from L. ductus ‘leading, aqueduct’ from duct-, ducere ‘lead’.