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The American Society of Hematology (ASH) leads the world in promoting and supporting clinical and scientific hematology research through its many innovative award programs, meetings, publications, and advocacy efforts. ASH Research Programs and Awards. Learn More. ASH Agenda for Hematology Research. Learn More. Annual Meeting Abstracts. Learn More.
- Overview
- Physical description
- Pests and diseases
- Major species
ash, (genus Fraxinus), genus of 45–65 species of trees or shrubs (family Oleaceae) primarily distributed throughout the Northern Hemisphere. Several species are valuable for their timber and beauty. A few species extend into the tropical forests of Mexico and Java.
Most ash trees are small to medium in height, though some of the larger timber-providing species grow to 18–34 metres (60–120 feet). The leaves of ash trees are opposite, usually deciduous, and pinnately compound with an odd number of leaflets, often five to nine. The narrow fruits, called samaras, are one-seeded and winged. The flowers usually are small and grow in showy clusters, and some species have petaled blooms.
Britannica Quiz
Ash trees are susceptible to a number of pests and diseases. The emerald ash borer (Agrilus planipennis), a beetle introduced into eastern and central North America in the 1990s, probably embedded in shipping materials from eastern Asia, has been responsible for the deaths of hundreds of millions of ash trees. In 2022 the pest was reported on the W...
Eighteen species of ash are found in the United States, several of which are valued for their timber. The most important of these are the white ash (Fraxinus americana) and the green ash (F. pennsylvanica), which grow throughout the eastern and much of the central United States and northward into parts of Canada. These two species furnish wood that is stiff, strong, resilient, and yet lightweight. This “white ash” is used for baseball bats, hockey sticks, paddles and oars, tennis and other racket frames, and the handles of shovels, spades, hoes, rakes, and other agricultural tools.
The black ash (F. nigra) of eastern North America, the blue ash (F. quadrangulata) of the Midwest, and the Oregon ash (F. latifolia) of the Pacific Northwest furnish wood of comparable quality that is used for furniture, interior paneling, and barrels, among other purposes. The Mexican ash (F. uhdei), a broad-crowned tree that is widely planted along the streets of Mexico City, reaches a height of 18 metres (59 feet), and has leaves with five to nine leaflets.
The European ash (F. excelsior), with 7 to 11 leaflets, is a timber tree of wide distribution throughout Europe. A number of its varieties have been cultivated and used in landscaping for centuries. Notable among these are forms with dwarflike or weeping habits, variegated foliage, warty twigs and branches, and curled leaves.
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The flowering ash (F. ornus) of southern Europe produces creamy white fragrant flowers, has leaves with seven leaflets, and reaches 21 metres (69 feet). The Chinese ash (F. chinensis) yields Chinese white wax.
- The Editors of Encyclopaedia Britannica
The meaning of ASH is any of a genus (Fraxinus) of trees of the olive family with pinnate leaves, thin furrowed bark, and gray branchlets. How to use ash in a sentence.
ASH meaning: 1 : the soft gray powder that remains after something (such as a cigarette or wood) has been completely burned and destroyed by fire; 2 : the burned parts that remain when something is destroyed often used figuratively
Wood ash. Ash or ashes are the solid remnants of fires. Specifically, ash refers to all non-aqueous, non-gaseous residues that remain after something burns. In analytical chemistry, to analyse the mineral and metal content of chemical samples, ash is the non-gaseous, non-liquid residue after complete combustion.
what is left of something after it has been destroyed by fire, especially what is left of a human body after it has been burned: Her ashes were scattered at sea. See more. SMART Vocabulary: related words and phrases. Products of fire. ashy. belch. burn something to a cinder. cinder. clinker. ember. fumes. haze. smokeless. smokily. smoky. smut.
a light color that is grayish or does not have any red in it: ash blonde His wife is tall, with ash blonde hair. The restaurant's stunning interior is decorated in soft shades of plum, ash, and cream. More examples. SMART Vocabulary: related words and phrases.
