ca·nal
 /kəˈnæl/  noun  ,  pl   -nals [  count  ]
  1 : a long narrow place that is filled with water and was created by people so that boats could pass through it or to supply fields, crops, etc., with water
   irrigation canals
   the Panama Canal
  2 medical : a tube or passageway in the body — see also birth canal, root canal