"German measles," 1883, Modern Latin, literally "rash," from neuter plural of Latin rubellus "reddish," diminutive of ruber "red" (from PIE root *reudh- "red, ruddy.").
rubbish
rubble
rub-down
rube
Rube Goldberg
rubella
Rubenesque
Rubicon
rubicund
Rubik's Cube
ruble