Adjective
radio-active (comparative more radio-active, superlative most radio-active)
Dated spelling of radioactive.
The base emotions Plato banned have left a radio-active and not radiant land. Libby Houston
Boltwood, B.B., 1907, On the ultimate disintegration products of the radio-active elements. Source: Internet
He believed that he had discovered a fourth state of matter, which he called "radiant matter", Radio-activity induced by the oscillatory discharge, or, The subsequent radio-active emanation from substances exposed to the Tesla oscillatory discharge. Source: Internet
Named for its location (it's on the site of the old Marconi House) the historic theme extends to the cocktail menu, which includes concoctions named Radio-Active and AM/FM. Source: Internet
Some resources actually naturally deplete in amount without human interference, the most notable of these being radio-active elements such as uranium, which naturally decay into heavy metals. Source: Internet