| riband | <chemical> Riband jasper, a variety of jasper having stripes of different colours, as red and green. Source: Websters Dictionary (01 Mar 1998) |
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| Ribas-Torres disease | A mild form of smallpox. See: variola minor. (05 Mar 2000) |
| ribavirin | <drug, protein> A nucleoside analogue approved as a treatment for respiratory syncytial virus. Ribavirin also has shown activity against hepatitis C, but its use in HIV infection is highly controversial. It is possible that it enhances the activity of ddl. (23 Aug 1998) |