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, free radical, 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
7. (adj) extremist, radical, ultra
(used of opinions and actions) far beyond the norm
Synonyms: radical, revolutionary, ultra, basal, extremist
Antonyms: old, incident, incidental, cauline, moderate
8. (adj) revolutionary, radical
markedly new or introducing radical change
Synonyms: radical, revolutionary, ultra, rotatory, basal, extremist
Antonyms: cauline, moderate, old, incidental, incident
9. (adj) radical
arising from or going to the root or source
Synonyms: revolutionary, ultra, basal, extremist
Antonyms: incidental, cauline, old, moderate, incident
10. (adj) radical
of or relating to or constituting a linguistic root
Synonyms: revolutionary, ultra, basal, extremist
Antonyms: old, cauline, incident, moderate, incidental
11. (adj) radical, basal
especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem
Synonyms: radical, revolutionary, base, ultra, basal, extremist, primary
Antonyms: moderate, incident, cauline, incidental, old
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Synonyms and Antonyms of radical 
