ra

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• March 2. 2016 from wordnet.princeton.edu

  RA — noun — english

  (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"

• March 2. 2016 from wordnet.princeton.edu

  Ra — noun — english

  ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods

• February 16. 2013 from wordnet.princeton.edu

  ra — noun — english

  an intensely radioactive metallic element that occurs in minute amounts in uranium ores