A friend, pal, buddy, mate.
The inner meaning or purpose.
The pith of certain plants.
Bone marrow biopsy.
The essence; the best part.
The substance inside bones which produces blood cells.
A kind of vegetable like a large courgette/zucchini or squash.
A friend, associate or colleague.
Research into one's opponent's family, friends, and past, which aims to uncover activities or interests which embarrass or discredit them.