The heartwood.
heartwood - the dense inner part of a tree trunk, yielding the hardest timber.
The inner core is very dense. It is the densest part of the planet.
inner core
The Inner Core is the most dense part of the Earth. It is a solid core of iron and nickel.
One can buy heartwood from a wood shop or woodcutter's yard. Heartwood is the dense inner part of a tree trunk and it is this section that is mostly used for the hardest timber.
a trunk port is called a trunk because it is part of the back end of a car - ie a trunk.
The stem of the tree is called the trunk and the outermost part of the trunk is called the bark of the trunk.
The inner part of a pumpkin is called the "pulp."
The part surrounding the inner core is called the outer core. It is a layer of molten metal that surrounds the solid inner core of the Earth.
The inner part of a fruit is often called the pulp.
Core
Pulp