Other Definitions
ra (enc)
ra (dict)
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Ra| Noun | 1. | Ra - an intensely radioactive metallic element that occurs in minute amounts in uranium oresmetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. uranium ore - any ore from which uranium can be extracted | | | 2. | RA - (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"astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole angular distance - the angular separation between two objects as perceived by an observer; "he recorded angular distances between the stars" | | | 3. | Ra - ancient hawk-headed Egyptian sun god; a universal creator | |
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