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  1. [noun] an intensely radioactive metallic element that occurs in minute amounts in uranium ores
    Synonyms: dium, Ra, atomic number 88

  2. [noun] (astronomy) the angular distance eastward along the celestial equator from the vernal equinox to the intersection of the hour circle that passes through the body; expressed in hours and minutes and second; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"
    Synonyms: right ascension, RA, celestial longitude

  3. [noun] ancient hawk-headed Egyptian sun god; a universal creator
    Synonyms: Ra, Re


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