the spongy white tissue lining the rind of oranges, lemons, and other citrus fruits

the essence of something

a book that he believed contained the pith of all his work

vigour and conciseness of expression

he writes with a combination of pith and exactitude

remove the pith from

peel and pith the oranges

pierce or sever the spinal cord of (an animal) so as to kill or immobilize it