RDF

1. Radio direction-finding (or -finder)
2. Refuse-derived fuel

• arpeggiones
• arpeggios
• arpent
• arpents
• arpillera
• arpilleras
• arquebus
• arquebusade
• arquebusades
• arquebuses
• arquebusier
• arquebusiers
• arr.
• ARR
• arracacha
• arracachas
• arrack
• arracks
• arragonite
• arrah
• arraign
• arraigned
• arraigner
• arraigners
• arraigning