Noun | 1. | radical - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule Synonyms: chemical group, group |
2. | radical - an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells" Synonyms: free radical | |
3. | radical - a person who has radical ideas or opinions | |
4. | radical - a character conveying the lexical meaning of a logogram | |
5. | radical - a sign placed in front of an expression to denote that a root is to be extracted Synonyms: radical sign | |
6. | radical - (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem" | |
Adj. | 1. | radical - (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative" |
2. | radical - markedly new or introducing radical change; "a revolutionary discovery"; "radical political views" Synonyms: revolutionary | |
3. | radical - arising from or going to the root; "a radical flaw in the plan" | |
4. | radical - of or relating to or constituting a linguistic root; "a radical verb form" | |
5. | radical - 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; "basal placentation"; "radical leaves" Synonyms: basal Antonyms: cauline - especially of leaves; growing on a stem especially on the upper part of a stem; "cauline leaves" |