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radical (adj.)

14世纪末,在中世纪哲学意义上,来自拉丁语晚期 radicalis "根的或有根的",来自拉丁语 radix (genitive radicis )"根"(来自PIE根 *wrād- "分支、根")。意义为"走向起源,必不可少",来自1650年代。数学中的 Radical sign ,来自1680年代。

政治意义上的"改革派"(通过"从根本上改变"的概念)最早记载于1802年(n.),1817年(adj.),英国自由党极端派( radical reform ,自1786年以来一直是现行用语);意义上的"不拘一格"来自1921年。美国青年俚语的使用是从1983年开始的,来自70年代的冲浪者俚语,意思是"在控制的极限"。 Radical chic 是从1970年开始考证的;即使不是由Tom Wolfe创造的,也是由Tom Wolfe普及的。 Radical empiricism 是1897年由William James创造的(见 empiricism )。

radical (n.)

16世纪30年代,"词根部分,来自 radical (副词)政治意义从1802年开始;化学意义从1816年开始。

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Definitions of radical from WordNet
1
radical (n.)
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule;
Synonyms: group / chemical group
radical (n.)
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;
in the body free radicals are high-energy particles that ricochet wildly and damage cells
Synonyms: free radical
radical (n.)
a person who has radical ideas or opinions;
radical (n.)
(mathematics) a quantity expressed as the root of another quantity;
radical (n.)
a character conveying the lexical meaning of a logogram;
radical (n.)
(linguistics) the form of a word after all affixes are removed;
Synonyms: root / root word / base / stem / theme
2
radical (adj.)
(used of opinions and actions) far beyond the norm;
radical opinions on education
Synonyms: extremist / ultra
radical (adj.)
markedly new or introducing radical change;
radical political views
Synonyms: revolutionary
radical (adj.)
arising from or going to the root or source;
a radical flaw in the plan
radical (adj.)
of or relating to or constituting a linguistic root;
a radical verb form
radical (adj.)
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;
radical leaves
Synonyms: basal
From wordnet.princeton.edu