Canal vs. Foramen

An artificial waterway or artificially improved river used for travel, shipping, or irrigation.

(anatomy) A tubular channel within the body.

(astronomy) One of the faint, hazy markings resembling straight lines on early telescopic images of the surface of Mars.

To dig an artificial waterway in or to (a place), especially for drainage

To travel along a canal by boat

An artificial channel filled with water and designed for navigation, or for irrigating land, etc.

A tube or duct; as, the alimentary canal; the semicircular canals of the ear.

A long and relatively narrow arm of the sea, approximately uniform in width; - used chiefly in proper names; as, Portland Canal; Lynn Canal.

(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion

a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance;

Example: ‘the tear duct was obstructed’; ‘the alimentary canal’; ‘poison is released through a channel in the snake's fangs’;

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

provide (a city) with a canal

an artificial waterway constructed to allow the passage of boats or ships inland or to convey water for irrigation

Example: ‘the Oxford Canal’; ‘they travelled on by canal’;

a tubular duct in a plant or animal, serving to convey or contain food, liquid, or air

Example: ‘the ear canal’;

any of a number of linear markings formerly reported as seen by telescope on the planet Mars.

Canals are waterway channels, or artificial waterways, for water conveyance, or for servicing water transport vehicles. They carry free surface flow under atmospheric pressure, and can be thought of as artificial rivers.

(skeleton) An opening, an orifice, or a short passage, especially in a bone.

Example: ‘The skull contains a number of foramina through which arteries, veins, nerves, and other structures enter and exit.’;

A small opening, perforation, or orifice; a fenestra.

a natural opening or perforation through a bone or a membranous structure

In anatomy and osteology, a foramen (; plural foramina, or foramens ) is an open hole that is present in extant or extinct amniotes. Foramina inside the body of animals typically allow muscles, nerves, arteries, veins, or other structures to connect one part of the body with another.