1. Occurring ever half hour

1. Every thirty minutes, every half hour

See also: periodic, periodical

• redneck
• redness
• redo
• redolence
• redolent
• redolently
• Redonda
• redouble
• redoubled
• redoubt
• redoubtable
• redound
• redox
• redpoll
• redraft
• redraw
• redress
• redressal
• redroot
• redshank
• redshift
• redshirt
• Redskin
• redstart
• redstem storksbill