1. An artificial waterway constructed for use by shipping, for irrigation, or for recreational use.
A canal may take in parts of natural rivers along its course.
2. In astronomy, an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion.
3. A bodily passage or tube lined with epithelial cells and conveying a secretion or other substance.
4. An anatomical tube in the body, or a tube-shaped passage in the body, carrying air, liquids, or semisolid materials.
5. Etymology: from Latin
canalis, "pipe, groove, channel"; from
canna, "reed"
Originally it was "a pipe for liquid", its sense was changed in about 1673 to "artificial waterway".
Government by cannon; usurpation supported by cannon.
A law; a criterion, or standard, used in making judgments.
To declare someone a saint.
A narrow valley between high cliffs.
A long groove indicating a body of water joining two larger bodies of water; a passageway.