|1.||of, relating to, or characteristic of the basic or inherent constitution of a person or thing; fundamental: a radical fault|
|2.||concerned with or tending to concentrate on fundamental aspects of a matter; searching or thoroughgoing: radical thought; a radical re-examination|
|3.||favouring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc: a radical party|
|4.||med (of treatment) aimed at removing the source of a disease: radical surgery|
|5.||slang chiefly (US) very good; excellent|
|6.||of, relating to, or arising from the root or the base of the stem of a plant: radical leaves|
|7.||maths of, relating to, or containing roots of numbers or quantities|
|8.||linguistics of or relating to the root of a word|
|9.||a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions|
|10.||maths a root of a number or quantity, such as ³√5, √x|
|11.||chem Also: radicle|
|a. short for free radical|
|b. another name for group|
|12.||linguistics another word for root|
|13.||(in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning|
|[C14: from Late Latin rādīcālis having roots, from Latin rādix a root]|
radical rad·i·cal (rād'ĭ-kəl)
A group of elements or atoms usually passing intact from one compound to another but generally incapable of prolonged existence in a free state.
A free radical.
Of or being medical treatment by extreme, drastic, or innovative measures.
Designed to act on or eliminate the root or cause of a pathological process.
|radical (rād'ĭ-kəl) Pronunciation Key
In politics, someone who demands substantial or extreme changes in the existing system.