A soft, spongy substance found inside plant parts, specifically in the center of roots and stems, or the whitish inner portion of the rind of a citrus fruit.

A noun "pith" refers to the soft tissue found inside human or animal bodies, organs, horns, feathers, spinal cords, and brains, as well as the soft inner portion of a loaf of bread in ireland, southern england, and the west country.

A central or essential part of something, embodying strength, courage, and power in speech or writing.

(mathematics) One divided by pi, that is, 1 π {\displaystyle {\frac {1}{\pi }}} (approximately 0.31831…).

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

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