1. An enclosed conduit for a fluid
   "The air conditioning duct needed cleaning to improve airflow"
    
2. A bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
   "the tear duct was obstructed";
   - epithelial duct, canal, channel
    
3. A continuous tube formed by a row of elongated cells lacking intervening end walls
   "The xylem duct transported water up the plant stem"

Derived forms: ducts

Type of: conduit, passage, passageway, plant part, plant structure

Part of: tracheophyte, vascular plant

Encyclopedia: Duct