Dictionary

The soft, spongy substance in the center of the stems of many plants and trees.

The spongy interior substance of a feather or horn.

The spinal cord; the marrow.

The albedo of a citrus fruit.

To extract the pith from (a plant stem or tree).

To kill (especially cattle or laboratory animals) by cutting or piercing the spinal cord.

One divided by pi.

The ordinal form of the number pi.

Example: The pith root of pi is approximately 1.439...