Word · Frequency #2361
radical
激进分子
A person who has radical ideas or opinions, especially one who wants complete social or political change.
- 1.
A root (of a number or quantity).
(数或量的)根。
- 2.
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
基团
- 3.
In logographic writing systems such as the Chinese writing system, the portion of a character used to index it. Often, but not always, this is also the portion indicating meaning; compare the following sense.
表意文字(如汉字)中用于检索字的部分；通常也表义,但并非总是如此；参见下义。
- 4.
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
自由基
- 5.
In Celtic languages, the basic, underlying form of an initial consonant which can be further mutated under the Celtic initial consonant mutations.
凯尔特语中首辅音的基本形式,可经历凯尔特语首辅音音变。
- 6.
a person who has radical ideas or opinions
激进分子
- 7.
In Semitic languages, any one of the set of consonants (typically three) that make up a root.
闪米特语中构成词根的一组辅音(通常为三个)中的任意一个。
- 8.
A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
由共价键连接的一组原子,作为一个单元参与反应。
- 9.
A free radical.
自由基。
- 10.
Given an ideal I in a commutative ring R, another ideal, denoted Rad(I) or √, such that an element x ∈ R is in Rad(I) if, for some positive integer n, xn ∈ I; equivalently, the intersection of all prime ideals containing I.
交换环R中,对于理想I,记为Rad(I)或√的理想,使得元素x∈R属于Rad(I)当且仅当存在正整数n使x^n∈I；等价地,所有包含I的素理想的交集。
- 11.
Given a ring R, an ideal containing elements of R that share a property considered, in some sense, "not good".
环R中由具有某种“不良”性质的元素组成的理想。
- 12.
The intersection of maximal submodules of a given module.
给定模的全体极大子模的交集。
- 13.
The product of the distinct prime factors of a given positive integer.
给定正整数的不同质因数的乘积。
- 14.
A person with radical opinions.
持激进观点的人。
部首；自由基；基团；根；根式；词根辅音
In use
The radical was arrested for protesting against the government's new policy.
A free radical is a highly reactive atom or molecule that can damage cells.
In mathematics, the radical of a number is its square root or nth root.
in the body free radicals are high-energy particles that ricochet wildly and damage cells
a radical
可数名词，指主张极端变革的人。
He is considered a radical.
他被视为一个激进分子。
free radicals
常用复数形式，化学术语。
Free radicals are highly reactive.
自由基具有高度反应性。
Connections
Collocations
- political radical
- 政治激进分子
- He was labeled a political radical for his extreme views.他因极端观点被贴上政治激进分子的标签。
- radical activist
- 激进活动家
- The radical activist organized a protest against the new law.这位激进活动家组织了一场抗议新法律的行动。
- free radical
- 自由基
- Antioxidants help neutralize free radicals in the body.抗氧化剂有助于中和体内的自由基。
- radical reaction
- 自由基反应
- This chemical process involves a radical reaction mechanism.这个化学过程涉及自由基反应机理。
- radical sign
- 根号
- Write the square root using a radical sign.用根号写出平方根。
- radical expression
Learner notes
Memory Tip
联想 radical 中的 rad 像 root（根），助记'根'（数学根号、化学自由基）。
Context & Register
多用于政治讨论或媒体报道，指持有极端改革观点的人，语气可能中立或略带批评。
Pronunciation & Spelling
These words share the spelling ending 'ical' but do not rhyme with 'radical' because the stressed vowel sounds differ. 'Radical' has /æ/ in the first syllable, while these words have /ɛ/, /ɪ/, /ə/, etc. They are useful for comparing spelling patterns only.
Usage priority
Collins 词频等级为 4，建议结合例句记忆，而不是只背中文释义。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.