Definitions from Wiktionary ( )

▸ noun:  (botany)
▸ noun:  The soft, spongy substance inside plant parts; specifically, the parenchyma in the centre of the roots and stems of many plants and trees.
▸ noun:  The albedo (“whitish inner portion of the rind”) of a citrus fruit.
▸ noun:  (by extension)
▸ noun:  Senses relating to humans and animals.
▸ noun:  The soft tissue inside a human or animal body or one of their organs; specifically, the spongy interior substance of a horn or the shaft of a feather.
▸ noun:  Chiefly of animals: the soft tissue inside a spinal cord; the spinal marrow; also, the spinal cord itself.
▸ noun:  (obsolete) Synonym of diploe (“the thin layer of soft, spongy, or cancellate tissue between the bone plates which constitute the skull”)
▸ noun:  (obsolete, rare) The soft tissue of the brain.
▸ noun:  (Ireland, Southern England, West Country) The soft inner portion of a loaf of bread.
▸ noun:  (figurative)
▸ noun:  The central or innermost part of something; the core, the heart.
▸ noun:  The essential or vital part of something; the essence.
▸ noun:  Physical power or strength; force, might.
▸ noun:  A quality of courage and endurance; backbone, mettle, spine.
▸ noun:  The energy, force, or power of speech or writing; specifically, such force or power due to conciseness; punch, punchiness.
▸ noun:  Chiefly in of (great) pith and moment: gravity, importance, substance, weight.
▸ verb:  To render insensate or kill (an animal, especially cattle or a laboratory animal) by cutting, piercing, or otherwise destroying the spinal cord.
▸ verb:  To extract the pith from (something or (figurative) someone).
▸ adjective:  (mathematics) The ordinal form of the number pi (π; approximately 3.14159…).
▸ noun:  (mathematics) One divided by pi, that is, 1/π (approximately 0.31831…).

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