Etymology
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ras

Ethiopian title of chief ministers, generals, governors, etc., from Amharic ras "chief, head," from Arabic ra's.

updated on April 24, 2021

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Definitions of ras from WordNet

ras (n.)
the network in the reticular formation that serves an alerting or arousal function;
Synonyms: reticular activating system
From wordnet.princeton.edu, not affiliated with etymonline.