(medicine) Any of a group of disorders characterized by progressive degeneration of the white matter of the brain, caused by imperfect growth or development of the myelin sheath that acts as an insulator around nerve fibres.
preundertaking
pseudobankrupt
pseudobrookite
pseudobrookite
noun
(mineralogy) An orthorhombic-dipyramidal mineral containing iron, magnesium, oxygen, and titanium.
