1. [ noun ] (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 minutes and second
Synonyms: celestial_longitude right_ascension

"one hour of right ascension equals fifteen degrees"

Related terms: angular_distance astronomy
2. [ noun ] (chemistry) an intensely radioactive metallic element that occurs in minute amounts in uranium ores
Synonyms: atomic_number_88 radium
Related terms: metallic_element uranium_ore
3. [ noun ] Last name, frequency rank in the U.S. is 28459
4. [ noun ] (religion,antiquity) ancient hawk-headed Egyptian sun god; a universal creator
Synonyms: Re
Related terms: Egyptian_deity
Similar spelling:   ray