"canals" in the noun sense
astronomy) an indistinct surface feature of Mars once thought to be a system of channels they are now believed to be an optical illusion
2. duct, epithelial duct, canal, channel
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
"the tear duct was obstructed"
"the alimentary canal"
"poison is released through a channel in the snake's fangs"
long and narrow strip of water made for boats or for irrigation
"canals" in the verb sense
1. canal, canalize, canalise
provide (a city) with a canal
Source: WordNet® (An amazing lexical database of English)
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