Meaning

noun the network in the reticular formation that serves an alerting or arousal function

noun an intensely radioactive metallic element that occurs in minute amounts in uranium ores

noun 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

originVarious origins: * Borrowed from Czech Raš and Polish Raś, a pet form of various Slavic personal names * Borrowed from Spanish Ras, from ras (“level”); perhaps a topographic surname for someone who lived on flat land * Borrowed from French and Catalan Ras, from ras (“shorn, peeled, bare”), hence a topographic surname for someone who lived on a barren or razed area * Borrowed from Dutch Ras,…

Etymology from Wiktionary, CC BY-SA 3.0