protagonist /prə- or prō-tagˈə-nist/

1. Orig the chief actor, character or combatant
2. Now often applied to any (or in pl, all) of the main personages or participants in a story or event
3. (loosely) a champion or advocate

• radiosensitised
• radiosensitises
• radiosensitising
• radiosensitive
• radiosensitize
• radiosensitized
• radiosensitizes
• radiosensitizing
• radiosonde
• radiosondes
• radio spectra
• radio spectrum
• radio star
• radio stars
• radio station
• radio stations
• radio-strontium
• radiotelegram
• radiotelegrams
• radiotelegraph
• radiotelegraphs
• radiotelegraphy
• radiotelemeter
• radiotelemeters
• radiotelephone