pith

The soft, spongy substance inside plant parts; specifically, the parenchyma in the centre of the roots and stems of many plants and trees.

This ſvveete ſmelling Reede is of a darke dun colour, full of ioints and knees eaſie to be broken into ſmall ſplinters, hollovv and full of a certaine vvhite pith, cobvveb vviſe, ſomevvhat gummie in eating, and hanging in the teeth, and of a ſharpe bitter taſte.

Some make inciſion into the very Vine braunch, as farre as to the pith and marrovv vvithin (to divert the moiſture that feedeth the grape:) others lay the cluſters a drying upon tile-houſes: and all this is done vvith the grapes of the Vine Helvenaca.

The albedo (“whitish inner portion of the rind”) of a citrus fruit.

Senses relating to humans and animals.

Senses relating to humans and animals.

Becauſe many do hold this opinion that this diſeaſe doth conſume the marrovv of the backe: […] [s]ome againe, do tvvine out the pith of the backe vvith a long vvire thruſt vp into the horſſes head, and ſo into his necke and backe, vvith vvhat reaſon I knovv not.

Senses relating to humans and animals.

To render insensate or kill (an animal, especially cattle or a laboratory animal) by cutting, piercing, or otherwise destroying the spinal cord.

To extract the pith from (something or (figurative) someone).

And yet, instead of exclaiming "Send this inconceivable Satanist to the stake," the respectable newspapers pith me by announcing "another book by this brilliant and thoughtful writer."

The ordinal form of the number pi (π; approximately 3.14159…).

The pith root of pi is approximately 1.439…

(e^pi*i*i/2), or e^(-pi/2), which is the reciprocal of the square root of e to the pith power.