(chemistry) The uncharged form of an aminoxide derived from hydroxylamines by removal of a proton; their structure is best represented as R₂NO^. <=> R₂N^(.+)-O⁻.

(chemistry) A positively charged radical ion.

(geometry) A point at which the radical lines of three circles meet. / Pertaining to radical centrism.

(mathematics) The line containing the locus of points from which the segments respectively tangent to two given circles have equal length.

(chemistry) A negatively charged radical ion.

(chemistry) Any radical that also carries an electric charge; typically, the charge and unpaired electron are associated with the same atom.

plural of radical ion

The phase of radicalization in which a person wishes to join a radical group and disclaim their prior identity (name, family, country).

Any of a set of 214 radicals (the portion of a Chinese character that provides an indication of its meaning) introduced in the Zihui and named after the more popular Kangxi Dictionary. This set of radicals has become the standard for sorting and ordering Chinese characters.

(politics, feminism) A type of feminism which calls for a radical reordering of society to eliminate male supremacy in all social and economic contexts.