radical

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radical

 [rad´ĭ-kal]
1. thorough or sweeping; directed to the cause or root of a morbid process.
2. a group of atoms that enters into and goes out of chemical combination without change and that forms one of the fundamental constituents of a molecule.
color radical chromophore.
free radical a radical that carries an unpaired electron; such radicals are extremely reactive, with a very short half-life.
oxygen radical a toxic metabolite of oxygen, such as superoxide or singlet oxygen, capable of damaging microorganisms and normal tissues.

rad·i·cal

(rad'i-kăl), Do not confuse this word with radicle.
1. In chemistry, a group of elements or atoms usually passing intact from one compound to another, but usually incapable of prolonged existence in a free state (for example, methyl, CH3); in chemical formulas, a radical is often distinguished by being enclosed in parentheses or brackets.
2. Thorough or extensive; relating or directed to the extirpation of the root or cause of a morbid process; for example, a radical operation.
3. Denoting treatment by extreme, drastic, or innovative, as opposed to conservative, measures.
4. Synonym(s): free radical
5. A functional group in a molecule or molecular entity.
[L. radix (radic-), root]

radical

/rad·i·cal/ (rad´ĭ-k'l)
1. directed to the root or cause; designed to eliminate all possible extensions of a morbid process.
2. a group of atoms that enters and goes out of chemical combination without change.

free radical  a radical that carries an unpaired electron; such radicals are extremely reactive, with a very short half-life.

radical

(răd′ĭ-kəl)
adj.
1. Departing markedly from the usual or customary; extreme or drastic: a radical change in diet.
2. Medicine Relating to or being surgery that is extreme or drastic in an effort to eradicate all existing or potential disease: radical hysterectomy.
3. 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.

rad′i·cal·ly adv.
rad′i·cal·ness n.

radical

[rad′ikəl]
Etymology: L, radix, root
1 n, an atom or group of atoms that contains an unpaired electron. A radical does not exist freely in nature except for O2, NO, and NO2.
2 adj, pertaining to drastic therapy, such as the surgical removal of an organ, limb, or other part of the body.

rad·i·cal

(rad'i-kăl)
1. chemistry A group of elements or atoms usually passing intact from one compound to another, but usually incapable of prolonged existence in a free state (e.g., methyl, CH3); in chemical formulas, a radical is often distinguished by being enclosed in parentheses or brackets.
2. Directed to the extirpation of the root or cause of a morbid process, e.g., a radical operation.
3. Denoting treatment by extreme, drastic, or innovative, as opposed to conservative, measures.
4. Synonym(s): free radical.
[L. radix (radic-), root]

radical

(of plants) arising from the root or crown.

rad·i·cal

(rad'i-kăl)
1. In chemistry, a group of elements or atoms usually passing intact from one compound to another, but usually incapable of prolonged existence in a free state (e.g., methyl, CH3).
2. Thorough or extensive; relating or directed to the extirpation of the root or cause of a morbid process.
3. Denoting treatment by extreme, drastic, or innovative, as opposed to conservative, measures.
[L. radix (radic-), root]

radical,

n 1. a group of atoms that acts together and forms a component of a compound. The group tends to remain bound together when a chemical reaction removes it from one compound and attaches it to another compound. A radical does not exist freely in nature.
adj 2. a drastic measure to cure or prevent the spread of a serious disease, such as the surgical removal of an organ, limb, or other body part.

radical

1. directed to the cause; going to the root or source of a morbid process.
2. a group of atoms that enters into and goes out of chemical combination without change and that forms one of the fundamental constituents of a molecule.

free radical
a radical, extremely reactive, and having a very short half-life (10−5 s or less in an aqueous solution), which carries an unpaired electron.
References in periodicals archive ?
Principles Constituting the Programme of the Cyprus National Radicalist Union
The members of the Cyprus National Radicalist Union--Greek inhabitants of the Island of Cyprus--being profoundly conscious of their obligations to themselves as human beings on the one hand and on the other of their great Greek fatherland and the immortal Greek civilization (decide as follows):--
9) They shall observe strictly the principles of the Cyprus Nationalist Radicalist Union--they shall be inspired with these only, looking solely to the idea and not at all to persons in the carrying out of their national struggle.
10) They shall work with perseverance for the propagation of the Cyprus National Radicalist Union and they shall follow faithfully its programme and decisions.
108) Baxter notes that the major difference between a radicalist approach like his and an "Americanist" one like Hehir's lies in different understandings of the nature of the polis in social ethics: "[In] the Americanist tradition, the polis is identified with the modern state, in particular with the United States of America, and as a result, the state is seen as the primary mechanism for the implementation of justice.
110) In contrast to the institutional and theoretical separation of theology from politics out of which Hehir operates, the Catholic radicalist tradition "promotes interaction between theology and politics and economics based on its claim that philosophical reason becomes too easily distorted when it is not elevated and corrected by the truths of revelation.
Roman Catholic understandings of mediation, creation, and the limits of human understandings of God pose several fundamental challenges to a radicalist approach such as Baxter's.
Another significant portion was known as the radicalists, who wanted immediate independence and union with Syria.