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[pith] /pɪθ/

Botany. the soft, spongy central cylinder of parenchymatous tissue in the stems of dicotyledonous plants.
Zoology. the soft inner part of a feather, a hair, etc.
the important or essential part; essence; core; heart:
the pith of the matter.
significant weight; substance; solidity:
an argument without pith.
Archaic. spinal cord or bone marrow.
Archaic. strength, force, or vigor; mettle:
men of pith.
verb (used with object)
to remove the pith from (plants).
to destroy the spinal cord or brain of.
to slaughter, as cattle, by severing the spinal cord.
the soft fibrous tissue lining the inside of the rind in fruits such as the orange and grapefruit
the essential or important part, point, etc
weight; substance
(botany) Also called medulla. the central core of unspecialized cells surrounded by conducting tissue in stems
the soft central part of a bone, feather, etc
verb (transitive)
to destroy the brain and spinal cord of (a laboratory animal) by piercing or severing
to kill (animals) by severing the spinal cord
to remove the pith from (a plant)

Old English piþa “pith of plants,” also “essential part,” from West Germanic *pithan- (cf. Middle Dutch pitte, Dutch pit, East Frisian pit), a Low German root of uncertain origin. Figurative sense was in Old English. Pith helmet (1889, earlier pith hat, 1884) so called because it is made from the dried pith of the Bengal spongewood.

“to kill by piercing the spinal cord,” 1805, from pith (n.). Related: Pithed; pithing.

pith (pĭth)

v. pithed, pith·ing, piths
To sever or destroy the spinal cord of a vertebrate animal, usually by means of a needle inserted into the vertebral canal.
Noun The soft, spongy tissue in the center of the stems of most flowering plants, gymnosperms, and ferns. Pith is composed of parenchyma cells. In plants that undergo secondary growth, such as angiosperms, the pith is surrounded by the vascular tissues and is gradually compressed by the inward growth of the vascular tissue known as xylem. In plants with woody stems, the pith dries out and often disintegrates as the plant grows older, leaving the stem hollow. See illustration at xylem.



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