Roseola \Ro*se"o*la\, n. [NL., dim. of L. rosa a rose.] (med.)
A rose-colored efflorescence upon the skin, occurring in
circumscribed patches of little or no elevation and often
alternately fading and reviving; also, an acute specific
disease which is characterized by an eruption of this
character; -- called also {rose rash}. -- {Ro*se"o*lous}, a.
[1913 Webster]