Ra /ˈrɑ/
  [埃及神話] 太陽神
  Ra n. A roe; a deer. [Obs.]
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  Ra
       n 1: an intensely radioactive metallic element that occurs in
            minute amounts in uranium ores [syn: radium, atomic
            number 88]
       2: (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" [syn:
           right ascension, celestial longitude]
       3: ancient hawk-headed Egyptian sun god; a universal creator
          [syn: Re]