A pure substance.
A thing that is the most perfect example of its type; the most perfect embodiment of something; epitome, prototype.
The fifth alchemical element, or essence, after earth, air, fire, and water that fills the universe beyond the terrestrial sphere.
The essence of a thing in its purest and most concentrated form.
A hypothetical form of dark energy postulated to explain observations of an accelerating universe.
To reduce to its purest and most concentrated essence.
A material in its unprocessed, natural state considered usable for manufacture.
Any physical product serving as input to a factory or other installation which processes it.