ra

Noun
  1. An intensely radioactive metallic element that occurs in minute amounts in uranium ores (synset 114676100)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    substance meronym: uranium ore - any ore from which uranium can be extracted
    same as: atomic number 88, radium
  2. 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 (synset 109536351)
    referred to in: antiquity - the historic period preceding the Middle Ages in Europe
    is an instance of: egyptian deity - a deity worshipped by the ancient Egyptians
    same as: re
  3. (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 (synset 108650766)
    "one hour of right ascension equals fifteen degrees"
    referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: angular distance - the angular separation between two objects as perceived by an observer
    same as: celestial longitude, right ascension

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