Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: RA
  1. (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 RA equals fifteen degrees";
    - right ascension, celestial longitude
Noun: Ra  raa
  1. An intensely radioactive metallic element that occurs in minute amounts in uranium ores
    - radium, atomic number 88
  2. (antiquity) 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
    - Re

Derived forms: Ras

Type of: angular distance, Egyptian deity, metal, metallic element

Part of: uranium ore

Encyclopedia: RA

Ra, Fiji