emitting or relating to the emission of ionizing radiation or particles
coined in 1898 by Marie and Pierre Curie from radio- (from Latin radius 'ray') + active
Marie Curie invented this word and won Nobel Prizes in both Physics and Chemistry for her radioactivity research - she's still the only person to win Nobels in two different sciences!
Complete word intelligence in one call. Free tier — 50 lookups/day.