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sillimanite
Science; General science
A nesosilicate mineral of composition Al 2 O(SiO 4 ), crystallizing in the orthorhombic system, space group Pbnm, a = 0.744, b = 0.760, and c = 0.575 nanometers, ...
dumortierite
Science; General science
A nesosilicate mineral with composition Al 7 (BO) 3 (SiO 4 ) 3 O 3 . Dumortierite crystallizes in the orthorhombic system but well-formed crystals are rare; the mineral usually ...
willemite
Science; General science
A nesosilicate mineral, composition Zn 2 SiO 4 , crystallizing in the hexagonal system. It is usually massive or granular with a vitreous luster; crystals are rare. The mineral ...
ice field
Science; General science
A network of interconnected glaciers or ice streams, with common source area or areas, in contrast to ice sheets and ice caps. The German word Eisstromnetz , which translates ...
Tourette's syndrome
Science; General science
A neurobehavioral disorder that is characterized by frequent, recurrent motor and vocal tics (described in 1885 by the French neurologist Gilles de la Tourette). The motor tics of ...
autism
Science; General science
A neurodevelopmental condition that impairs the way that a person relates to and communicates with other people. Persons with autism also can have unusual behaviors, such as ...
multiple sclerosis
Science; General science
A neuromuscular disorder that characteristically involves the destruction of myelin, the insulating material around nerve fibers. The onset of the disease is unusual in persons ...
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