Source : Webster's Revised Unabridged Dictionary (1913)

Rubella \Ru*bel"la\, n. [NL., fr. L. rubellus reddish.] (Med.)
   An acute specific disease with a dusky red cutaneous eruption
   resembling that of measles, but unattended by catarrhal
   symptoms; -- called also {German measles}.

Source : WordNet®

rubella
     n : a contagious viral disease that is a milder form of measles
         lasting three or four days; can be damaging to a fetus
         during the first trimester [syn: {German measles}, {three-day
         measles}, {epidemic roseola}]