Webster's English Dictionary

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aqueduct

aq.ue.duct \'ak-w*-.d*kt\ n [L aquaeductus, fr. aquae (gen. of aqua) + 
   ductus act o]f leading - more at DUCT 1a: a conduit for water; esp : one 
   for carrying a large quantity of  flowing water 1b: a structure for 
   conveying a canal over a river or hollow  2: a canal or passage in a part 
   or organ