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radical

radical


rad·i·cal  (rd-kl)
adj.
1. Arising from or going to a root or source; basic: proposed a radical solution to the problem.
2. Departing markedly from the usual or customary; extreme: radical opinions on education.
3. Favoring or effecting fundamental or revolutionary changes in current practices, conditions, or institutions: radical political views.
4. Linguistics Of or being a root: a radical form.
5. Botany Arising from the root or its crown: radical leaves.
6. Slang Excellent; wonderful.
n.
1. One who advocates fundamental or revolutionary changes in current practices, conditions, or institutions: radicals seeking to overthrow the social order.
2. Mathematics The root of a quantity as indicated by the radical sign.
3. Symbol R An atom or a group of atoms with at least one unpaired electron.
4. Linguistics See root1.

[Middle English, of a root, from Late Latin rdclis, having roots, from Latin rdx, rdc-, root; see wrd- in Indo-European roots.]

radi·cal·ly adv.
radi·cal·ness n.

radical [ˈrædɪkəl]
adj
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. (Government, Politics & Diplomacy) favouring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc a radical party
4. (Medicine) Med (of treatment) aimed at removing the source of a disease radical surgery
5. Slang chiefly US very good; excellent
6. (Life Sciences & Allied Applications / Botany) of, relating to, or arising from the root or the base of the stem of a plant radical leaves
7. (Mathematics) Maths of, relating to, or containing roots of numbers or quantities
8. (Linguistics) Linguistics of or relating to the root of a word
n
1. (Government, Politics & Diplomacy) a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions
2. (Mathematics) Maths a root of a number or quantity, such as 3√5, √x
3. (Chemistry) Chem
a.  short for free radical
b.  another name for group [10]
4. (Linguistics) Linguistics another word for root1 [9]
5. (Linguistics) (in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning
[from Late Latin rādīcālis having roots, from Latin rādix a root]
radicalness  n

radical  (rd-kl)
1. A root, such as 2, especially as indicated by a radical sign ().
2. A group of atoms that behaves as a unit in chemical reactions and is often not stable except as part of a molecule. The hydroxyl, ethyl, and phenyl radicals are examples. Radicals are unchanged by chemical reactions.


radical  /rdkl/  n. a person with very strong nontraditional beliefs, esp. s.o. who wants change in politics or religion: Radicals won several seats in Parliament this year.
adj. 1 having very strong nontraditional beliefs, ideas: Radical students protested the Presidents visit to their college campus. 2 very unusual, different from what is normal: We noticed a radical difference in our sons behavior after he finished college and got a job. -adv. radically. radical

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