parenchyma

Definitions

  • WordNet 3.6
    • n parenchyma animal tissue that constitutes the essential part of an organ as contrasted with e.g. connective tissue and blood vessels
    • n parenchyma the primary tissue of higher plants composed of thin-walled cells that remain capable of cell division even when mature; constitutes the greater part of leaves, roots, the pulp of fruits, and the pith of stems
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Webster's Revised Unabridged Dictionary
    • n parenchyma pȧ*rĕṉ"kĭ*mȧ (Biol) The soft cellular substance of the tissues of plants and animals, like the pulp of leaves, the soft tissue of glands, and the like.
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Century Dictionary and Cyclopedia
    • n parenchyma In anatomy and zoology: The proper tissue or substance of any part or organ, as distinguished from the connective or other sustentacular tissue which it contains.
    • n parenchyma The undifferentiated body-substance or chyme-mass of the unicellular animal, as an infusorian; indistinguishable cell-substance; endoplasm.
    • n parenchyma The general substance of the interior of the parenchymatous worms.
    • n parenchyma In botany, the fundamental cellular tissue of plants: contradistinguished from prosenchyma, or fibrovascular tissue. It is the soft thin-walled tissue, with approximately isodiametric cells, which composes the soft pulp of leaves between the network of veins, the pulp of fruits, etc. In a dicotyledonous stem it forms the outer bark, the pith, and the medullary rays; in monocotyledons it is the common mass, of loose texture, through which the definite fibrovascullar bundles are distributed. While the ordinary or typical shape of the cells is polyhedral or spheroidal, there are numerous modifications, all of which formerly received special designations, but only a few principal types are now distinguished by names. Spongy parenchyma is tissue in which the cells are loosely aggregated and have large intercellular spaces. Elongated parenchyma-cells are more compactly combined than short ones, and in the upper side of leaves have received the significant name of palisade-cells. Flattened parenchyma-cells are seen in the medullary rays of dicotyledons. Collenchyma, sclerotic and suberous parenchyma, trichomes, etc., are further modifications. See collenchyma. palisadecell, sclerotic, suberous, trichome, and cuts under cellular, cystolith, and tissue.
    • n parenchyma Also parenchyme.
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Chambers's Twentieth Century Dictionary
    • n Parenchyma pa-reng′ki-mä the soft cellular tissue of glandular and other organs, as the pith in plants or the pulp in fruits
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Etymology

Webster's Revised Unabridged Dictionary
NL., from Gr. pare`gchyma, fr. paregchei^n to pour in beside; para` beside + 'en in + chei^n to pour: cf. F. parenchyme,
Chambers's Twentieth Century Dictionary
Gr., para, beside, engchein, to pour in.

Usage

In literature:

It contains a pulpy parenchyma, soft, unctuous, very brown, in which are embedded black, brilliant, very small seeds.
"The Commercial Products of the Vegetable Kingdom" by P. L. Simmonds
Coniferous woods have no pores, their rays are always narrow and inconspicuous, and wood parenchyma is never prominent.
"Studies of Trees" by Jacob Joshua Levison
There is a sclerenchymatous ring close to the epidermis but separated from it by a few layers of parenchyma.
"A Handbook of Some South Indian Grasses" by Rai Bahadur K. Ranga Achariyar
In cross section this tissue resembles parenchyma, and appears as if it were made up of rounded cells.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc." by George Francis Atkinson
They have only vessels, wood fibres, and a few parenchyma cells.
"Seasoning of Wood" by Joseph B. Wagner
The parenchyma is not confined to the stem or branches, but extends over every part of the plant.
"Conversations on Chemistry, V. 1-2" by Jane Marcet
The raphe runs through the parenchyma found in the cleft of the berry.
"All About Coffee" by William H. Ukers
The fluid (blood) or the parenchyma of the organs (bone-marrow, spleen, etc.
"Histology of the Blood" by Paul Ehrlich
When the air-cells and parenchyma become inflamed, it is called inflammation of the lungs.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
They are the chief constituents of the fleshy parenchyma of fruits, tubers, rhizomes.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5" by Various
At the beginning, either in the embryo or in an incipient shoot from a bud, the whole stem is of tender cellular tissue or parenchyma.
"The Elements of Botany" by Asa Gray
Its parenchyma was soft and flabby, but contained no abscesses or infractions.
"The Life and Public Services of James A. Garfield" by Emma Elizabeth Brown
It is not necessary to deal here with most of the cells that occur in the parenchyma or gelatinous part of the sponge.
"Freshwater Sponges, Hydroids & Polyzoa" by Nelson Annandale
In many genera xylem-parenchyma is present, but never in great abundance.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7" by Various
Diseases of parenchyma, 120.
"Disease in Plants" by H. Marshall Ward
The commonest of the latter are inflammations of the parenchyma of the lungs.
"A System of Practical Medicine by American Authors, Vol. I" by Various
These are filled with polygonal cells, which form the true parenchyma of the body.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour
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In news:

Fulminant pneumonia with cavitary destruction of lung parenchyma.
Fulminant pneumonia with cavitary destruction of lung parenchyma.
Ultrasound examination of the abdomen showed multiple small echogenic foci with distal shadowing that was seen bilaterally in the renal parenchyma at the corticomedullary junction.
Imaging of brain parenchyma in stroke.
Congenital lobar emphysema ( CLE ) A histologic view of the lung parenchyma affected by CLE revealed the characteristically enlarged and overdistended alveoli and rupturing of the interalveolar septae due to the overdistension.
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