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hartshorn, spirits of

(Encyclopedia)hartshorn, spirits of: see ammonia. ...

Hattin, Battle of

(Encyclopedia)Hattin, Battle of hättēnˈ [key], battle on July 4, 1187, in N Palestine, where Saladin's Muslim forces defeated the Christian armies of Guy de Lusignan. When Saladin attacked Tiberias in July, 1187...

Hawaii, University of

(Encyclopedia)Hawaii, University of, at Honolulu (Manoa Campus), Hilo, and Pearl City (West Oahu Campus) with additional community college campuses; land-grant and state supported; coeducational; chartered 1907, op...

Hook of Holland

(Encyclopedia)Hook of Holland: see Hoek van Holland. ...

Horn of Africa

(Encyclopedia)Horn of Africa, peninsula, NE Africa, opposite the S Arabia Peninsula. Also known as the Somali Peninsula, it encompasses Somalia and E Ethiopia and is the easternmost extension of the continent, sepa...

Hildebert of Lavardin

(Encyclopedia)Hildebert of Lavardin hĭlˈdəbərt, lăvˈərdĭn; lävärdăNˈ [key], c.1056–1133, French churchman, bishop of Le Mans (1096–1125), and archbishop of Tours (1125–33). He was taken prisoner w...

Hildebrand, Lay of

(Encyclopedia)Hildebrand, Lay of, fragment of an epic in mixed Low and Old High German composed c.800 in the monastery of Fulda. Hildebrand, armorer of Dietrich of Bern (Theodoric the Great), returns home after man...

Antalcidas, Peace of

(Encyclopedia)Antalcidas, Peace of: see Corinthian War. ...

Angoulême, Margaret of

(Encyclopedia)Angoulême, Margaret of or Marguerite d': see Margaret of Navarre. ...

heat of combustion

(Encyclopedia)heat of combustion, heat released during combustion. In particular, it is the amount of heat released when a given amount (usually 1 mole) of a combustible pure substance is burned to form incombustib...