pith - Dictionary definition and meaning for word pith
pith sounds like "peeth" which is central to the body hence pith means important, central or essential part of something
think of brad pitt he's a very important part of hollywood
PEETH(human back)- peeth has visible marrow and that is pivotal organ of human body and so is pith as main idea..
Think "Pit" like the center of a peach which an essential part to help it grow.
pith is from "peeth" in Hind. or Sanskrit meaning "center" as in Vidya Peeth or Shakti Peeth, and so "pith" which means center or core