Blood that is needed for continued life; blood regarded as the seat of life.
That which is required for continued existence or function.
The substance inside bones which produces blood cells.
The inner meaning or purpose.
The pith of certain plants.
Bone marrow biopsy.
The essence; the best part.
A friend, pal, buddy, mate.
A kind of vegetable like a large courgette/zucchini or squash.