right triangleˌright ˈtriangle noun [countable] American English 
a triangle which has an angle of 90° SYN right-angled triangle British English
a triangle which has an angle of 90° SYN right-angled triangle British English- rowlock
- Rowntree Mackintosh
- royal
- Royal Academy
- Royal Academy of Music
- Royal Air Force
- Royal Albert Hall
- Royal and Ancient
- Royal Ascot
- Royal Ballet
- Royal Bank of Scotland
- royal blue
- Royal British Legion
- Royal Canadian Mounted Police
- Royal College of Art
- Royal College of Music
- Royal College of Nursing
- Royal Commission
- Royal Court
- Royal Doulton
- Royal Enclosure
- Royal Festival Hall
- royal flush
- Royal Green Jackets
- Royal Greenwich Observatory