The essence; the best part.
The inner meaning or purpose.
The pith of certain plants.
Bone marrow biopsy.
The substance inside bones which produces blood cells.
A friend, pal, buddy, mate.
A kind of vegetable like a large courgette/zucchini or squash.
The essence of a thing in its purest and most concentrated form.
A thing that is the most perfect example of its type; the most perfect embodiment of something; epitome, prototype.
A pure substance.
The fifth alchemical element, or essence, after earth, air, fire, and water that fills the universe beyond the terrestrial sphere.
A hypothetical form of dark energy postulated to explain observations of an accelerating universe.
To reduce to its purest and most concentrated essence.