Source : Webster's Revised Unabridged Dictionary (1913)

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.