1. (noun)group, radical, chemical group (chemistry) two or more atoms bound together as a single unit and forming part of a molecule Synonyms: root, theme, root word, free radical, grouping, radical, mathematical group, base, chemical group, group, stem Antonyms: moderate, cauline, old, incidental, incident
2. (noun)free radical, radical an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule Synonyms: root, theme, root word, free radical, radical, base, chemical group, group, stem Antonyms: old, incidental, cauline, moderate, incident
3. (noun)radical a person who has radical ideas or opinions Synonyms: root, theme, root word, free radical, base, chemical group, group, stem Antonyms: incident, old, moderate, incidental, cauline
4. (noun)radical (mathematics) a quantity expressed as the root of another quantity Synonyms: root, theme, root word, free radical, base, chemical group, group, stem Antonyms: incidental, incident, old, moderate, cauline
5. (noun)radical a character conveying the lexical meaning of a logogram Synonyms: root, theme, root word, free radical, base, chemical group, group, stem Antonyms: cauline, moderate, incidental, old, incident
6. (adj)root, root word, base, stem, theme, radical (linguistics) the form of a word after all affixes are removed Synonyms: al-Qaeda, idea, groundwork, al-Qaida, ascendent, base, substructure, composition, paper, fundament, motif, prow, theme, ascendant, basis, group, understructure, shank, stalk, nucleotide, report, foundation, etymon, radical, root, subject, floor, bow, fore, topic, freeradical, melodic theme, source, ancestor, foot, antecedent, musical theme, infrastructure, alkali, cornerstone, origin, pedestal, home, rootage, tooth root, stem, base of operations, radix, root word, stand, stem turn, solution, beginning, chemical group, al-Qa'ida, bag Antonyms: old, moderate, cauline, incidental, incident
1. radical The widely divergent senses in which the word radical is used, by which it can be at some time interchanged with any word in the above list, are all formed upon the one primary sense of having to d Synonyms: radical, complete, ingrained, perfect, constitutional, innate, positive, entire, native, primitive, essential, natural, thorough, extreme, organic, thoroughgoing, fundamental, original, total Antonyms: conservative, incomplete, palliative, slight, tentative, inadequate, moderate, partial, superficial, trial
Synonyms for radical 
