| RU | any of numerous trees or shrubs or vines of the family Rubiaceae |
|---|---|
| RU | an order of dicotyledonous plants of the subclass Asteridae |
| RU | a yellow or orange variety of ruby spinel |
| RU | a line that when crossed permits of no return and typically results in irrevocable commitment |
| RU | the boundary in ancient times between Italy and Gaul |
| RU | inclined to a healthy reddish color often associated with outdoor life |
| RU | a soft silvery metallic element of the alkali metal group |
| RU | a method of dating based on the decay of rubidium-87 into the stable isotope strontium-87 |
| RU | make ruby red |
| RU | test to determine the patency of the Fallopian tubes |
| RU | Russian composer and pianist (1829-1894) |
| RU | United States pianist (born in Poland) known for his interpretations of the music of Chopin (1886-1982) |