The essence of something.
The liquid that has been condensed from vapour during distillation; normally a purified form or a fraction of an original liquid.
Diesel fuel.
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.