REGENERATION
- 8 dictionary results
re•gen•er•a•tion
[ri-jen-uh-rey-shuh n]
–noun
1.
act of regenerating; state of being regenerated.
2.
Electronics. a feedback process in which energy from the output of an amplifier is fed back to the grid circuit to reinforce the input.
3.
Biology. the restoration or new growth by an organism of organs, tissues, etc., that have been lost, removed, or injured.
4.
Theology. spiritual rebirth; religious revival.
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Origin:
1300–50; ME regeneracion < LL regenerātiōn- (s. of regenerātiō). See regenerate, -ion
—Related forms
non•re•gen•e•ra•tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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Word Origin & History
regeneration
c.1300, from L.L. regenerationem (nom. regeneratio) "a being born again," from L. regeneratus, pp. of regenerare "make over, generate again," from re- "again" + generare "to produce" (see generation). Specifically of animal tissue, 1540s; of forests, 1888.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
re•gen•er•a•tion (rĭ-jěn'ə-rā'shən) n.
1. The act or process of regenerating or the state of being regenerated.
2. Spiritual or moral revival or rebirth.
3. Biology Regrowth of lost or destroyed parts or organs.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Medical Dictionary
re•gen•er•a•tion definition
Pronunciation: /ri-ˌjen-ə-ˈrā-shən, ˌrē-/
Function: n
1 : an act or the process of regenerating : the state of being regenerated
2 : the renewal, regrowth, or restoration of a body or a bodily part, tissue, or substance after injury or as a normal bodily process <continual regeneration of epithelial cells><regeneration of the uterine lining>compare REGULATION 2A
Merriam-Webster's Medical Dictionary, © 2007 Merriam-Webster, Inc.
regeneration re•gen•er•a•tion (rĭ-jěn'ə-rā'shən)
n.
Regrowth of lost or destroyed parts or organs.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science Dictionary
regeneration (rĭ-jěn'ə-rā'shən) Pronunciation Key
The regrowth of lost or destroyed parts or organs.
Our Living Language : Regeneration of parts or, in some cases, nearly the entire body of an organism from a part, is more common than one might think. Many protists like the amoeba that have been cut in half can grow back into a complete organism so long as enough of the nuclear material is undamaged. Severed cell parts, such as flagella, can also be regrown in protists. New plants can be grown from cuttings, and plants can often be regenerated from a mass of fully differentiated cells (such as a section of a carrot root), which, if isolated in a suitable environment, turn into a mass of undifferentiated cells that develop into a fully differentiated organism. The capacity for regeneration varies widely in animals, with some able to regenerate whole limbs and others not, but the capacity is reduced significantly in more complex animals. Certain simple invertebrates like the hydra are always regenerating themselves. If cut into tiny pieces that are then mixed up, the pieces can reorganize themselves and grow back into a complete organism. Flatworms have the capacity to regenerate themselves from only a small mass of cells. If they are chopped up into fine pieces, each piece has the capacity to develop into an entire organism. Starfish, which are echinoderms, can regenerate their entire body from their central section and a single arm. Newts and salamanders can regenerate lost legs and parts of eyes, but many other amphibians such as frogs and toads cannot. Certain lizards can regenerate their tails. In many animals, these regenerated body parts are not as large as the originals but are usually sufficient to be functional. Many higher animals such as mammals regularly regenerate certain tissues such as hair and skin and portions of others such as bone, but most tissues cannot be regenerated. About 75 percent of the human liver can be removed, and it will regenerate into a functional organ. The physiological reasons for this are still not understood. Regeneration in this case takes the form of the enlargement of the remaining structures rather than the re-creation of the lost ones. Thus, there are four mechanisms for tissue regeneration in animals: the reorganization of existing cells (as in the hydra), the differentiation of stored stem cells into the specific tissues needed (as in the salamander), the dedifferentiation of neighboring tissue cells and their subsequent regrowth as cells of the needed type (as in plants as well as certain animals like the salamander), and the compensatory growth of the surviving cells of the specific tissue (as in the human liver). There is a great interest in stem cells because of their potential use in regenerating body tissues, such as nerve cells and heart muscle. The biochemical mechanisms for dedifferentiation are also the subject of intense study.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Bible Dictionary
Regeneration definition
only found in Matt. 19:28 and
Titus 3:5. This word literally means a "new birth." The Greek word so rendered (palingenesia) is used by classical writers with reference to the changes produced by the return of spring. In Matt. 19:28 the word is equivalent to the "restitution of all things" (
Acts 3:21). In
Titus 3:5 it denotes that change of heart elsewhere spoken of as a passing from death to life (
1 John 3:14); becoming a new creature in Christ Jesus (
2 Cor. 5:17); being born again (
John 3:5); a renewal of the mind (
Rom. 12:2); a resurrection from the dead (
Eph. 2:6); a being quickened (2:1, 5). This change is ascribed to the Holy Spirit. It originates not with man but with God (
John 1:12, 13;
1 John 2:29; 5:1, 4). As to the nature of the change, it consists in the implanting of a new principle or disposition in the soul; the impartation of spiritual life to those who are by nature "dead in trespasses and sins." The necessity of such a change is emphatically affirmed in Scripture (
John 3:3;
Rom. 7:18; 8:7-9;
1 Cor. 2:14;
Eph. 2:1; 4:21-24).
Easton's 1897 Bible Dictionary
Encyclopedia
regeneration
in biology, the process by which some organisms replace or restore lost or amputated body parts
Learn more about regeneration with a free trial on Britannica.com.
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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