"canals" in the noun sense
1. canal
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"
3. canal
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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