Ra-. A prefix, from the Latin re and ad combined, coming to us through the French and Italian. See Re-, and Ad-.
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Ra
n 1: an intensely radioactive metallic element that occurs in
minute amounts in uranium ores [syn: radium, atomic
number 88]
2: (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" [syn:
right ascension, celestial longitude]
3: ancient hawk-headed Egyptian sun god; a universal creator
[syn: Re]