lemonish, adj.lemonlike, lemony, adj.
/lem"euhn/, n.
1. the yellowish, acid fruit of a subtropical citrus tree, Citrus limon.
2. the tree itself.
3. See lemon yellow.
4. Informal. a person or thing that proves to be defective, imperfect, or unsatisfactory; dud: His car turned out to be a lemon.
5. made of or with lemon.
6. having the color, taste, or odor of lemon.
[1350-1400; 1905-10 for def. 4; < ML lemonium; r. ME lymon < ML limo, (s. limon-) < Pers limu, limun]

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Small thorny tree or spreading bush (Citrus limon) of the rue (or citrus) family and its edible fruit.

Under the yellow outer rind or peel is the white, spongy inner peel, the source of commercial pectin. The juicy pulp is acidic and rich in vitamin C and contains smaller amounts of B vitamins. The climates of coastal Italy and California are especially favourable for the cultivation of lemon trees, which in these regions produce fruit 6–10 times a year. Lemon juice enhances many dishes, and lemonade is a popular warm-weather beverage. Lemon by-products are used in beverages (citric acid), fruit jellies (pectin), and furniture polish (lemon oil).

Lemon (Citrus limon)

J. Horace McFarland Co.

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 (Citrus limon), small tree or spreading bush of the rue family (Rutaceae) and its edible fruit. The lemon forms a spreading bush or a small tree, 3–6 m (10–20 feet) high if not pruned. Its young leaves have a decidedly reddish tint; later they turn green. In some varieties, the young branches of the lemon are angular; some have sharp thorns at the axils of the leaves. The flowers have a sweet odour and are rather large, solitary or in small clusters in the axils of the leaves. Reddish-tinted in the bud, the petals are white above and reddish purple below.

      The fruit is oval with a broad, low, apical nipple and 8 to 10 segments. The outer rind, or peel, yellow when ripe and rather thick in some varieties, is prominently glandular-dotted. The white, spongy inner part of the peel, called the mesocarp, or albedo, is nearly tasteless and is the chief source of commercial grades of pectin. The seeds are small, ovoid, and pointed; occasionally, fruits are seedless. The pulp is decidedly acid. The predominant acid present is citric acid, which may amount to 5 percent or more by weight of the lemon's juice. Lemon juice is rich in vitamin C and contains smaller amounts of the B vitamins, particularly B1, B2, and niacin.

      The lemon was probably unknown to the ancient Greeks and Romans, but it was introduced into Spain and North Africa some time between the years AD 1000 and 1200. It was further distributed through Europe by the crusaders, who found the fruit growing in Palestine. In 1494 the fruit was being cultivated in the Azores and shipped largely to England. The lemon was thought by the 18th-century Swedish botanist Linnaeus to be a variety of the citron (Citrus medica), though it is now known to be a separate species.

      The chief varieties of lemons were formerly the Lisbon, a variety introduced from Australia, and the Eureka, a variety that originated from a seedling tree grown in California. Since the mid-20th century, new, more vigorous varieties such as the Frost Lisbon and the Frost Eureka have been developed that have a higher resistance to infection from fungal and other plant diseases. As a cultivated tree, the lemon is now grown to a limited extent in most tropical and subtropical countries.

      Lemon trees for commercial planting are usually propagated by budding the desired variety on seedlings of other citrus species, such as the sweet orange, grapefruit, mandarin orange, sour orange, or tangelo. Seedlings of these species are superior to lemon seedlings as rootstocks because they are more uniform and less susceptible to the various crown- and foot-rot diseases.

      The relatively cool, equable climatic zones of coastal Italy and California are especially favourable for lemon cultivation. The trees are commonly grown in orchards, spaced 5–8 m (16–26 feet) apart. Lemon trees usually bloom throughout the year, and the fruit is picked 6 to 10 times a year. Full-sized fruit for commercial purposes is about 50 mm (2 inches) in diameter. The fruit is usually picked while still green and, after curing, may be kept three months or more in storage.

      Young lemon trees reach bearing age as early as the third year after planting, and commercial crops may be expected during the fifth year. The average orchard yield per tree is 1,500 lemons a year. Because lemons bruise easily, the pickers must wear gloves and take great care when picking and handling the fruit. Careful handling is essential to prevent the loss of fruit in storage and transit due to fungal diseases. Picked lemons are graded in the packing house according to their maturity, which is indicated by their colour; yellow fruits are already fully ripe and must be sold immediately, while fruits that are still green are held in storage until they become a uniform yellow in colour.

      The United States and Italy are major producers of lemons. Other producing countries include Spain, Greece, Turkey, Argentina, Lebanon, Chile, Brazil, Israel, Australia, Tunisia, South Africa, Algeria, Cyprus, and Portugal. About half of the lemon crop is usually shipped to the fresh-fruit market.

      Juice of the lemon is a characteristic ingredient in many pastries and desserts, such as tarts and the traditional American lemon meringue pie. The astringent, distinctive flavour of the fruit is also used to enhance many poultry, fish, and vegetable dishes worldwide. Lemonade, made with lemon, sugar, and water, is a popular warm-weather beverage, and the juice itself is commonly added to tea.

      Among the important by-products of lemons are citric acid, citrate of lime, lemon oil, and pectin. Preparation of the oil, used in perfumes, soap, and flavouring extract, is an important industry in Sicily. Citric acid is used in beverage manufacturing. Pectin has long been an important material for making fruit jellies; it has also been used in medicine in the treatment of intestinal disorders, as an antihemorrhagic, as a plasma extender, and for other purposes.

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Universalium. 2010.

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