(inorganic chemistry) Any oxyanion of radon; any salt containing such an anion

plural of radonate

The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas. / The most stable isotope of this element, ²²²₈₆Rn.

plural of Radon measure

(mathematics) A measure on the σ-algebra of Borel sets of a Hausdorff space that is locally finite and inner regular.

plural of Radon point

(geometry) A point in the intersection of convex hulls specified by Radon's theorem.

(geometry) A theorem on convex sets, stating that any set of d + 2 points in Rᵈ can be partitioned into two sets whose convex hulls intersect.

A small glass or gold tube, containing radon gas, implanted in a patient as radiotherapy.

(dated) The unstable, radioactive, chemical element with atomic number 118, now named oganesson.