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Noun: RAS
  1. The network in the reticular formation that serves an alerting or arousal function
    - reticular activating system
Noun: RA
  1. (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
    "one hour of RA equals fifteen degrees";
    - right ascension, celestial longitude

Type of: angular distance, neural net, neural network

Part of: reticular formation, RF

Encyclopedia: RAS

RA