pith

a usually continuous central strand of spongy tissue in the stems of most vascular plants that probably functions chiefly in storage

any of various loose spongy plant tissues that resemble true pith

the soft or spongy interior of a part of the body

to kill (an animal) by piercing or severing the spinal cord

to destroy the spinal cord or central nervous system of (an animal, such as a frog) usually by passing a wire or needle up and down the spinal canal

to remove the pith from (a plant stem)

topee