A friend or mate
A person who maintains railway lines.
Someone who fiddles or tinkers with things.
An ostler; one who looks after the horses in a mine.
Someone whose job is to sand and grind small imperfections from metal and ceramic castings.
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.