/ dʌkt; NAmE / noun
1.
a pipe or tube carrying liquid, gas, electric or telephone wires, etc. :
a heating / ventilation duct
2.
a tube in the body or in plants through which liquid passes :
the bile duct
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WORD ORIGIN
mid 17th cent. (in the sense course or direction): from Latin ductus leading, aqueduct from duct- led, from the verb ducere .