RAS RAS

noun

the network in the reticular formation that serves an alerting or arousal function  ( RAS, reticular activating system )
the network in the reticular formation that serves an alerting or arousal function

 RA RA

noun

(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   ( celestial longitude, RA, right ascension )
(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
 one hour of right ascension equals fifteen degrees
one hour of right ascension equals fifteen degrees
 one hour of right ascension equals fifteen degrees
one hour of right ascension equals fifteen degrees

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  ( Ra, Re )
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

an intensely radioactive metallic element that occurs in minute amounts in uranium ores  ( atomic number 88, Ra, radium )
an intensely radioactive metallic element that occurs in minute amounts in uranium ores