tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination
of or providing nourishment
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
long and narrow strip of water made for boats or for irrigation
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
