can-, cann-

(Greek > Latin: reed, pipe; the word for "reed" in Hebrew, Arabic, and Egyptian was kaneh; then the word element passed into Greek and Latin, and into the languages of western Europe)

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.
canonize (verb), canonizes; canonized; canonizing
To declare someone a saint: Some churches in the past have canonized certain persons who were considered to be very holy and religious.
A narrow valley between high cliffs.
A long groove indicating a body of water joining two larger bodies of water; a passageway.

A cross reference of word units that are related, directly and/or indirectly, with "tube, pipe": aulo-; duc-, -duct (to lead, leading); fistul-; siphon-; syringo-; tub-.