Definition of Radical in English :

Define Radical in English

Radical meaning in English

Meaning of Radical in English

Pronunciation of Radical in English

Radical pronunciation in English

Pronounce Radical in English


see synonyms of radical


1. chemical group, group, radical

(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

2. 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

Example Sentences:
'in the body free radicals are high-energy particles that ricochet wildly and damage cells'

3. radical

a person who has radical ideas or opinions

4. radical

(mathematics) a quantity expressed as the root of another quantity

5. radical

a character conveying the lexical meaning of a logogram

6. base, radical, root, root word, stem, theme

(linguistics) the form of a word after all affixes are removed

Example Sentences:
'thematic vowels are part of the stem'


7. extremist, radical, ultra

(used of opinions and actions) far beyond the norm

Example Sentences:
'extremist political views'
'radical opinions on education'
'an ultra conservative'

8. radical, revolutionary

markedly new or introducing radical change

Example Sentences:
'a revolutionary discovery'
'radical political views'

9. radical

arising from or going to the root or source

Example Sentences:
'a radical flaw in the plan'

10. radical

of or relating to or constituting a linguistic root

Example Sentences:
'a radical verb form'

11. basal, 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

Example Sentences:
'basal placentation'
'radical leaves'

WordNet Lexical Database for English. Princeton University. 2010.


see synonyms of radical
of, relating to, or characteristic of the basic or inherent constitution of a person or thing; fundamental
a radical fault
concerned with or tending to concentrate on fundamental aspects of a matter; searching or thoroughgoing
radical thought
a radical re-examination
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
(of treatment) aimed at removing the source of a disease
radical surgery
5. slang, mainly US
very good; excellent
of, relating to, or arising from the root or the base of the stem of a plant
radical leaves
7. mathematics
of, relating to, or containing roots of numbers or quantities
8. linguistics
of or relating to the root of a word
a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions
10. mathematics
a root of a number or quantity, such as 3√5, √x
11. Also: radicle chemistry
a.  short for free radical
b.  another name for group (sense 10)
12. linguistics another word for root (sense 9)
(in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning

Collins English Dictionary. Copyright © HarperCollins Publishers


see synonyms of radical
of or from the root or roots; going to the foundation or source of something; fundamental; basic
a radical principle
extreme; thorough
a radical change in one's life
favoring fundamental or extreme change; specif., favoring basic change in the social or economic structure
b.  [R-]
designating or of any of various modern political parties, esp. in Europe, ranging from moderate to conservative in program
3.  Botany
of or coming from the root
4.  Ancient Mathematics
having to do with the root or roots of a number or quantity
a basic or root part of something
a fundamental
a person holding radical views, esp. one favoring fundamental social or economic change
b.  [R-]
a member or adherent of a Radical party
7.  Chemistry
a group of two or more atoms that acts as a single atom and goes through a reaction unchanged, or is replaced by a single atom: it is normally incapable of separate existence
8.  Ancient Mathematics
the indicated root of a quantity or quantities, shown by an expression written under the radical sign
radical sign

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.


see synonyms of radical
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 or drastic: a radical change in diet.
3. Relating to or advocating fundamental or revolutionary changes in current practices, conditions, or institutions: radical politics; a radical political theorist.
4. Medicine Relating to or being surgery that is extreme or drastic in an effort to eradicate all existing or potential disease: radical hysterectomy.
5. Linguistics Of or being a root: a radical form.
6. Botany
a. Of, relating to, or arising from a root: radical hairs.
b. Arising from the base of a stem or from a below-ground stem or rhizome: radical leaves.
7. Slang Excellent; wonderful.
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 one unpaired electron.
4. Linguistics See root1.
a. Any of the basic Chinese characters that are combined to form more complex characters.
b. Any of the traditional set of basic strokes or groups of strokes that make up Chinese characters and are used to classify and organize them in dictionaries.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.