What is "canalling"

vb. (present participle of canal English)

1. n. (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. 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" [syn: duct, epithelial duct, channel]

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

4. [also: canalling, canalled]

1. v. provide (a city) with a canal [syn: canalize, canalise]

2. [also: canalling, canalled]

See canal