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(măgnē`zhə), two ancient cities of Lydia, W Asia Minor (now W Turkey). They were colonies of the Magnetes, a tribe of E Thessaly. One city (Magnesia ad Maeandrum), SE of Smyrna (Izmir), was later colonized by Ionians and given by Artaxerxes I to Themistocles, who died there. There are important ruins on the site, including the celebrated temple of Artemis Leucophryene, built in the 2d cent. B.C. Magnesia ad Sipylum, on the Hermus River at the foot of Mt. Sipylus, NE of Smyrna, was (190 B.C.) the scene of the defeat of Antiochus III (Antiochus the Great) by the Romans. The modern ManisaManisa
, city (1990 pop. 158,283), capital of Manisa prov., W Turkey. It is a rail junction and the market center of a rich agricultural region. Mineral deposits are nearby.
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 is nearby.


common name for the chemical compound magnesium oxide, MgO. It occurs as colorless, cubic crystals. It is refractory, melting at about 2,800°C;. It is very slightly soluble in pure water but is soluble in acids and solutions of ammonium salts. The magnesia of commerce is a fine white powder used in soaps, cosmetics, pharmaceuticals, and as a filler in rubber goods. Magnesia is used to make crucibles and other ceramic goods. Crude magnesia is prepared by roasting dolomite (calcium magnesium double carbonate) or magnesite (magnesium carbonate). Pure magnesia is prepared by refining the crude product. Magnesia is also extracted from seawater. It occurs in nature as the mineral periclase.
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(inorganic chemistry)
Magnesium oxide that is processed for a particular purpose.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


A fine white powder of magnesium oxide; gives brick a yellow tint.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The global Electrical Grade Fused Magnesia market was valued at $XX million in 2018, and Radiant Insights Research analysts predict the global market size will reach $XX million by the end of 2028, growing at a CAGR of XX% between 2018 and 2028.
Addition of magnesia to systems containing limestone and metakaolin worsened the workability while addition of calcium hydroxide had no effect.
Active magnesia content refers to the amount of MgO in active magnesia cement.
Magnesia or Magnesia on the Maeander (Ancient Greek: [eth][pounds sterling][eth][eth][eth]'[eth][cedilla]Ia[eth][macron][eth] [sz]-i ICIu[sz]'[sup.1]Ie [eth][pounds sterling][eth][eth] [eth]1/4[eth]'[eth][sup.3]Iu[sz]A or [eth][pounds sterling][eth][eth][eth]'[eth][cedilla]Ia[eth][macron][eth] [sz]-i [sz]-...IC[sz]'[micro] [eth][pounds sterling][eth][eth] [eth]1/4[eth]'[eth][sup.3]Iu[sz]A; Latin: Magnesia ad Maeandrum) was an ancient Greek city in Ionia, considerable in size, at an important location commercially and strategically in the triangle of Priene, Ephesus and Tralles.
The Magnesia Bank is for sale at a freehold asking price of PS375,000.
However, model-based design technology was rarely introduced to practical industrial process control fields till now, especially in the control of smelting process of electro-fused magnesia furnace.
Still packaged in its original blue bottles, Phillips Milk of Magnesia has been in medicine cabinets since 1872.
Previous calcining tests on unbeneficiated magnesite produced magnesia with grades of about 92% MgO and about 4.5% SiO2.
The spectacular growth of Iran's steel industry is likely to provide a beacon for refractory mineral suppliers to the country, and in particular dead burned magnesia imports owing to the country's limited domestic sources of magnesite.
Japan-based Metso is providing a 900 tons per day lime calcining system to Martin Marietta Magnesia Specialties in Ohio, UU.
IF you have oily or acneprone skin, apply Milk of Magnesia every night using cotton wool.
Researchers had to tackle many challenges in order to produce magnesium from magnesia due to its relatively high equilibrium temperature, reversibility of the reaction, and the production of micro-structured and flammable products.