American Heritage® Dictionary of the English Language, Fourth Edition
- n. Anatomy The tissue characteristic of an organ, as distinguished from associated connective or supporting tissues.
- n. Botany The primary tissue of higher plants, composed of thin-walled cells and forming the greater part of leaves, roots, the pulp of fruit, and the pith of stems.
Century Dictionary and Cyclopedia
- n. 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. The undifferentiated body-substance or chyme-mass of the unicellular animal, as an infusorian; indistinguishable cell-substance; endoplasm.
- n. The general substance of the interior of the parenchymatous worms.
- n. 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. Also parenchyme.
- n. The functional part of an organ, as opposed to supporting tissue.
- n. botany The ground tissue making up most of the non-woody parts of a plant.
GNU Webster's 1913
- n. (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.
- n. 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
- n. animal tissue that constitutes the essential part of an organ as contrasted with e.g. connective tissue and blood vessels
- From Ancient Greek παρέγχυμα ("anything poured in beside"), from παρά 'alongside' + -enchyma. (Wiktionary)
- New Latin, from Greek parenkhuma, visceral flesh, from parenkhein, to pour in beside : para-, beside; see para-1 + en-, in; see en in Indo-European roots + khein, to pour; see gheu- in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“It is the cell-sap of the ordinary cell tissue or parenchyma, which is colored by the anthocyan, and for this reason all organs possessing this tissue, may exhibit the color in question.”
“Henceforward, if I ever make botanical quotations, I shall always call parenchyma, By-tis; prosenchyma, To-tis; and diachyma, Through-tis, short for By-tissue, To-tissue, and Through-tissue -- then the student will see what all this modern wisdom comes to!”
“Computer-assisted sterology: point fraction of lung parenchyma and alveolar surface density in fetal and newborn sheep.”
“Fetal tracheal occlusion for severe congenital diaphragmatic hernia in humans: A morphometric study of lung parenchyma and muscularization of pulmonary arterioles.”
“Vascular transport can be described as a diffusion process through plant root aerochyma (parenchyma containing large air spaces typical of emergent and marginal wetland species), which is a continuous network of gas-filled channels.”
“Heather and I made up a new meaning for parenchyma (some layer or something on your heart, whatever) and the new meaning (and spelling) turned out to be”
“Deposition of asbestos fibres in the parenchyma of the lung may result in the penetration of the visceral pleura from where the fibre can then be carried to the pleural surface, thus leading to the development of malignant mesothelial plaques.”
“The capsule is intact and slightly wrinkled, and the parenchyma is pale purple and trabecular.”
“In some cases, relief of vasomotor instability was more easily obtained with vitamin E than with the use of estrogen; however, the chief advantage of vitamin E over estrogens is its freedom of stimulative effect on the genital system or on the parenchyma of the breast.”
“The parenchyma cells, which line up with the cambial cells of stock and scion in the healing process, later become new cambial cells.”
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