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Any of a genus of paramyxoviruses, including the causal agents of measles and rinderpest, that infect humans and other vertebrates.
[New Latin morbillī, measles (from Medieval Latin, pustules, pox, pl. of morbillus, pustule, from diminutive of Latin morbus, disease; see mer- in Indo-European roots) + virus.]
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.
(Biology) a genus of viruses in the family Paramyxoviridae causing infectious diseases such as measles, distemper, or rinderpest
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014