What is the meaning of the word "stone"?

Definitions:

a lack of feeling or expression or movement noun
- You'd have to have a heart of stone to ignore the display of adoptable puppies.
building material consisting of a piece of rock hewn in a definite shape for a special purpose noun
- I wanted a special stone to mark the site.
kill by throwing stones at verb
- People wanted to stone the child's parents for living out of wedlock.
the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed noun
- you should remove the stones from prunes before cooking