yam


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yam,

common name for some members of the Dioscoreaceae, a family of tropical and subtropical climbing herbs or shrubs with starchy rhizomes often cultivated for food. The largest genus, Dioscorea, is commercially important in East Asia and in tropical America. The thick rhizomes, often weighing 30 lb (13.6 kg) or more, are used for human consumption and for feeding livestock. A number of species of Dioscorea are cultivated for extraction of diosgenin, a female hormone precursor used in the manufacture of the contraceptive pill. In the United States, cultivation of yams for food is restricted to the South, but the wild yam (sometimes used medicinally) is indigenous farther north, and another species, the cinnamon vine, is cultivated as a decorative plant. The sweet potatosweet potato,
trailing perennial plant (Ipomoea batatas) of the family Convolvulaceae (morning glory family), native to the New World tropics. Cultivated from ancient times by the Aztecs for its edible tubers, it was introduced into Europe in the 16th cent.
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, which belongs to the morning glory family, is sometimes erroneously called yam. The S African elephant's-foot (Testudinaria elephantipes), also called Hottentot bread and tortoise plant, is sometimes grown in greenhouses; its large rootstock was formerly eaten by the natives. Yams 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 Liliopsida, order Liliales, family Dioscoreaceae.

Yam

 

any one of more than 30 plant species of the genus Dioscorea of the family Dioscoreaceae. Yams are cultivated for their tubers in the tropics and subtropics. The tubers are different morphologically (thickening of the hypocotyl, internodes, or rhizomes). In some species, they reach a length of 1.5 m and a weight of 50 kg. The tubers are used as food in a way similar to potatoes. The poisonous substances found in the tubers of some species are usually destroyed during boiling or baking. The most important species are the Chinese yam (D. batatas), winged yam (D. alata), D. esculenta, and the air potato (D. bulbifera).

REFERENCES

Ipat’ev, A. N. Ovoshchnye rasteniia zemnogo shara. Minsk, 1966.
Siniagin, I. I. Tropicheskoe zemledelie. Moscow, 1968.
Uphof, J. C. T. Dictionary of Economic Plants, 2nd ed. Lehre, 1968.

What does it mean when you dream about a yam?

Yams are usually associated with the holiday season. The dreamer’s associations with this symbol may be rooted in memories of family celebrations. As a plant that grows under the ground, the yam is also a natural symbol of something deeply rooted in the unconscious mind.

yam

[yam]
(botany)
A plant of the genus Dioscorea grown for its edible fleshy root.
An erroneous name for the Puerto Rico variety of sweet potato; the edible, starchy tuberous root of the plant.

yam

1. any of various twining plants of the genus Dioscorea, of tropical and subtropical regions, cultivated for their edible tubers: family Dioscoreaceae
2. Southern US any of certain large varieties of sweet potato
3. a former Scot name for the (common) potato
References in periodicals archive ?
There were variations in the cell wall constituents of the yam varieties that were studied.
(ii) document farmers' perceptions about insect pests on stored yam chips and traditional management practices,
Another good thing is that you can easily add yams to your daily diet.
When Yam was completing a study exchange programme in 2013 in Bath, her family came to visit her but were unable to return to UAE because Yasir's work contract was cancelled.
When she spoke to the ECHO last year, Yam, who has spent many of her formative teenage years in Liverpool and considers herself a Scouser, said she would hate to leave.
Yam Root Powder-Global Market Status and Trend Report 2014-2026 offers a comprehensive analysis on Yam Root Powder industry, standing on the readers' perspective, delivering detailed market data and penetrating insights.
Yam was stabbed at the opening of a branch of the Beijing Easyhome building materials company where he was invited as a guest.
Ghana controls Africa's yam export market, which value of $13.7 billion exceeds all other African staple crops equivalent to the combined value of cassava, maize, millet, sorghum and rice.
Yam underwent a minor operation at a hospital in Zhongshan city, his manager Lester Mo said.
The man, believed to be in his thirties, chased Yam to stab him again, according to reports by Sina Entertainment.
Yam leaves, botanically classified as Dioscorea villosa, grow on a perennial climbing vine that thrives in tropical and subtropical climates and are members of the Dioscoreaceae family.
Fresh yam produce from West Africa continues to be in demand in Europe, North America and in some parts of Asia.