The definition of a duct is a tube, channel or passage that gas or liquid move through.(noun)
An example of a duct is the piping through which air conditioning enters into an office.
See duct in Webster's New World College Dictionary
Origin: ML ducta, conduit < L ductus, a leading, conducting, pp. of ducere, to lead < IE base *deuk-, to pull > tow, tug, L dux, leader
See duct in American Heritage Dictionary 4
Origin: Latin ductus, act of leading
Origin: , from
Origin: past participle of dūcere, to lead; see deuk- in Indo-European roots.
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