(~s)
1.
A ~ is a long, narrow stretch of water that has been made for boats to travel along or to bring water to a particular area.
...the Grand Union Canal.
...Venetian ~s and bridges.
N-COUNT
2.
A ~ is a narrow tube inside your body for carrying food, air, or other substances.
...delaying the food’s progress through the alimentary ~.
N-COUNT: usu supp N