1.Definition: (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion

Category: Objects

2.Definition: 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"

Related Noun(s):channel, duct

Category: General

3.Definition: long and narrow strip of water made for boats or for irrigation

Category: Objects