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n. (used with a sing. or pl. verb)
A severe form of measles characterized by dark, hemorrhagic skin eruptions. Also called hemorrhagic measles.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Pathology) (often functioning as singular) a severe form of measles characterized by dark eruptions caused by bleeding under the skin
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014