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say it: ras
ras is a noun meaning "the network in the reticular formation that serves an alerting or arousal function". It carries one recorded sense.
the network in the reticular formation that serves an alerting or arousal function
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ras come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.