HertfordshireHert‧ford‧shire /ˈhɑːtfədʃə $ ˈhɑːrtfərdʃɪr/ 
a county in southeast England, north of London
a county in southeast England, north of London- rocket science
- rocket scientist
- rock face
- rockfall
- rock garden
- rock-hard
- Rockies
- rocking chair
- rocking horse
- rock music
- Rockne, Knute
- rock 'n' roll
- Rock of Gibraltar
- rock pool
- rock salt
- rock-solid
- Rockwell, Norman
- Rocky
- rocky
- Rocky and Bullwinkle
- Rocky Horror Show, The
- Rocky Mountains
- rococo
- rod
- Roddick, Anita