| RAO | <abbreviation> Right anterior oblique, a radiographic projection. (05 Mar 2000) |
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| Raoult's law | The vapor pressure of a solution of a nonvolatile nonelectrolyte is that of the pure solvent multiplied by the mole-fraction of the solvent in the solution. (05 Mar 2000) |
| Raoult, Francois | <person> French physicist, 1830-1899. See: Raoult's law. (05 Mar 2000) |