noun
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels
Examples
- they are now believed to be an optical illusion
noun
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
Synonyms
Examples
- the tear duct was obstructed
- the alimentary canal
- poison is released through a channel in the snake's fangs
noun
long and narrow strip of water made for boats or for irrigation
verb
provide (a city) with a canal
Synonyms