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borough (1990 pop. 25,609), Allegheny co., SW Pa. on the Allegheny River, in a bituminous coal area; founded 1788, inc. 1956. It is a residential suburb of Pittsburgh. Apples and nursery stock are grown and there is dairying.


common name for a tree of any of many species of the genus Prunus of the family Rosaceae (roserose,
common name for some members of the Rosaceae, a large family of herbs, shrubs, and trees distributed over most of the earth, and for plants of the genus Rosa, the true roses.
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 family) and for its fruit, a drupe. The plum is generally cultivated in the temperate zones, though among the numerous varieties and hybrids are types suitable for many soils and sites. Of the plum's more than 100 species 30 are native to North America. It has been cultivated since prehistoric times, longer perhaps than any other fruit except the apple. Alexander the Great is said to have introduced it into Greece from Syria or Persia, where the damson plum had long been grown. The name damson is now applied to several varieties of Prunus domestica, the common garden plum of European or SW Asian origin, e.g., P. domestica var. insititia and others having small leaves and small, oval fruits usually borne in clusters. The fruits are generally tart and are favored for preserves. The greengages and pruneprune,
popular name for a dried plum. Fruits of the many varieties of Prunus domestica, which are firm-fleshed and dry easily without removal of the stone, are gathered after falling from the tree, dipped in lye solution to prevent fermentation, dried in the sun or in
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 plums are also varieties of P. domestica. Populations of plum trees that grow in the wild usually revert to the damson type. In the United States the wild red plum (P. americana) is found along streams and in thickets from New York to the Rocky Mts. Its small, sweet fruit has a purple bloom. This plum was utilized by Native Americans, who ate it raw, cooked, and dried; when dried it was a staple article of diet. Plum butter is made from it. Another American variety is the beach plum, or shore plum (P. maritima), a low-growing shrub common along the eastern coast, especially on Cape Cod, where the gathering of fruit for jelly and preserves became a commercial project. Most of the cultivated plums in the United States are derived from European and Japanese varieties (e.g., P. salicina, introduced by Burbank into the United States from Japan in 1870), although some good ones have come from native species and are valuable in that they thrive in the extreme north and south. The myrobalan, or cherry plum (P. cerasifera), is often used as an understock in plum cultivation. The European plum may be an ancient natural hybrid of this and another Middle Eastern species. The typical plum tree is low and wide-spreading and is one of the earliest fruit trees to bloom. In Japan, where there are many famous plum gardens, the feathery blossoms are much used in decoration. The plum is also of ornamental value in the United States, many of the varieties so used having red or purple foliage and double white, pink, or lilac flowers. The plum is closely related to the almond, apricot, cherry, and other species of the genus Prunus; a number of apricot-plum hybrids, such as the plumcot, Pluot, and Aprium, have been developed. Plums are classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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, class Magnoliopsida, order Rosales, family Rosaceae.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


Any of various shrubs or small trees of the genus Prunus that bear smooth-skinned, globular to oval, drupaceous stone fruit.
A clast embedded in a matrix of a different kind, especially a pebble in a conglomerate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

plum, plum stone

A large random-shaped stone which is dropped into freshly placed mass concrete to economize on the amount of concrete mortar required.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


symbol of faithfulness. [Flower Symbolism: Flora Symbolica, 176]
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.


1. a small rosaceous tree, Prunus domestica, with white flowers and an edible oval fruit that is purple, yellow, or green and contains an oval stone
2. the fruit of this tree
a. a dark reddish-purple colour
b. (as adjective): a plum carpet
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


A compiler for a substantial subset of PL/I for the Univac 1100, from the University of Maryland.

["PL/I Programming with PLUM", M.V. Zelkowitz, Paladin House, 1978].
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References in periodicals archive ?
The countries with the highest levels of plum and sloe per capita consumption in 2018 were Serbia (33 kg per person), Romania (23 kg per person) and Morocco (5,363 kg per 1000 persons).
This year's Gradacac Plum Fair lasts until August 31, announced the organizers.
This kind of plum growsonly in Nakhchivan and differs from other varieties of cherry plum by that it remains green until fully ripened.
He said that plum and apricot of Swat were popular in t Punjab and Sindh.
The CWB's Deputy Director Cheng Ming-dean said that the expected arrival of heavy plum rains has been shifted from the second week (June 12 - 18) June to the first week (5 - 11).
It's being organised by Horticulture Wales and the Vale of Clwyd Denbigh Plum Cluster.
The plum has been grown in the Vale of Clwyd for 230 years but is facing a tough time this season.
"With nearly four decades in commercial printing, we've learned that we continually need to re-invent ourselves and invest in technology to stay current with trends in marketing," says Peter Lineal, founder of Plum Grove.
In reality, the name marian plum is likely a derivative of mapraang, which is what the fruit is called in Thai.
There are different types of plum: dessert, which are sweet and juicy; culinary, which you cook; greengage, which are the smaller, yellow-greenish fruits; and damsons, which are good for jam making.
Or you can grow varieties that blossom a little later such as Marjorie's Seedling which is a lovely purple culinary plum.