1. Spiralling upward from right to left
   - sinistrorse

See also: sinistral

• riverine
• riverside
• rivet
• rivet line
• riveter
• riveting
• riveting machine
• rivetter
• Riviera
• Rivina
• Rivina humilis
• rivulet
• rivulus
• Riyadh
• riyal
• riyal-omani
• rms
• Rn
• RNA
• RNA polymerase
• RNase
• RNIB
• RNLI
• Ro
• ro-ro