English noun: Ra |
1. | Ra (substance) an intensely radioactive metallic element that occurs in minute amounts in uranium ores |
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| Synonyms | atomic number 88, radium |
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| Broader (hypernym) | metal, metallic element |
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| Substance meronym | uranium ore |
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2. | Ra (person) 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 |
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| Synonyms | Re |
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| Instance hypernym | Egyptian deity |
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| Domain category | antiquity |
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3. | RA (location) (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 |
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| Samples | One hour of right ascension equals fifteen degrees.
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| Synonyms | celestial longitude, right ascension |
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| Broader (hypernym) | angular distance |
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| Domain category | astronomy, uranology |
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