An Ethiopian prince or high-ranking noble; a title of honor

Holder of an Ottoman naval rank roughly equivalent to captain

Any of certain stone-covered morainic ridges in parts of Norway

retinoic acid syndrome

• redundant acronym syndrome
• replenishment at sea
• rail accessory system
• reticular activating system
• reasonable articulable suspicion
• renin-angiotensin system
• remote access service

Plural of Ra

Plural of RA (e.g., resident assistant; research assistant)