In a radical manner; fundamentally; very. / At the root.

ionizing radiation that is naturally present in the environment.

plural of radius

The shooting forth of anything from a point or surface, like diverging rays of light. / The process of radiating waves or particles. / The transfer of energy via radiation. / Radioactive energy.

Favoring fundamental change, or change at the root cause of a matter. / (botany, not comparable) Pertaining to a root (of a plant). / Pertaining to the basic or intrinsic nature of something.

(historical, 19th-century Britain) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).

Radiation (quantized as photons) consisting of oscillating electric and magnetic fields oriented perpendicularly to each other, moving through space.

Radiating light and/or heat. / Emitted as radiation. / Beaming with vivacity and happiness. / Strikingly beautiful. / Emitting or proceeding as if from a center.

A point source from which radiation is emitted. / (astronomy) The apparent origin, in the night sky, of a meteor shower.

To extend, send or spread out from a center like radii. / (transitive) To emit rays or waves. / (intransitive) To come out or proceed in rays or waves. / (transitive) To illuminate.