n.
A rose-colored skin rash, sometimes occurring with diseases such as measles, syphilis, or scarlet fever.
[New Latin, from diminutive of Latin roseus, rosy, from rosa, rose.]
roseolar ro·se'o·lar adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.