Difference between revisions of "Organ"

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1. An [[instrument]] or [[medium]] by which some important [[action]] is performed, or an important [[end]] accomplished; as, legislatures, courts, armies, taxgatherers, etc, are [[organs]] of [[government]].
2. (Science: biology) A [[natural]] part or [[structure]] in an [[animal]] or a [[plant]], capable of performing some special [[action]] (termed its [[function]]), which is [[essential]] to the [[life]] or well-being of the whole; as, the [[heart]], [[lungs]], etc, are [[organs]] of animals; the [[root]], [[stem]], [[foliage]], etc, are [[organs]] of [[plants]].
a group of [[tissues]] that perform a specific [[function]] or group of functions
In [[animals]] the [[organs]] are generally made up of several [[tissues]], one of which usually [[predominates]], and [[determines]] the [[principal]] [[function]] of the [[organ]]. [[Groups]] of [[organs]] constitute a system. See system.
Examples of [[animal]] organs are [[heart]], [[lungs]], [[brain]], [[eye]], [[stomach]], [[spleen]], [[bone]]s, [[pancreas]], [[kidney]]s, [[liver]], [[intestine]]s, [[skin]], [[urinary bladder]] and sex organs
3. A [[component]] part performing an [[essential]] [[office]] in the working of any [[complex]] [[machine]]; as, the [[cylinder]], [[valves]], crank, etc, are [[organs]] of the [[steam engine]].
Examples of [[plant]] organs are the [[root]]s, [[stem]]s, [[leaves]], [[flower]]s, [[seed]]s and [[fruit]]s
4. A [[medium]] of [[communication]] between one [[person]] or [[body]] and another; as, the [[secretary]] of [[state]] is the [[organ]] of [[communication]] between the [[government]] and a [[foreign]] [[power]]; a newspaper is the [[organ]] of its editor, or of a party, sect, etc.
Word origin: L. Organum, Gr.; akin to work, and E. Work: cf. F. Organe.
5. [Cf. AS. [[Organ]], [[fr]]. L. [[Organum]].
A [[wind]] [[instrument]] containing numerous [[pipes]] of various [[dimensions]] and kinds, which are filled with [[wind]] from a [[bellows]], and played upon by [[means]] of keys [[similar]] to those of a piano, and sometimes by [[foot]] keys or [[pedals]]; formerly used in the plural, each [[pipe]] being considired an [[organ]]. ''The [[deep]], majestic, solemn [[organs]] [[blow]].'' ([[pope]])
Chaucer used the [[form]] orgon as a plural. ''The [[merry]] orgon . . . That in the church goon [go]'' [[barrel]] [[organ]], Choir [[organ]], Great [[organ]], etc. See [[barrel]], Choir, etc.
(Science: anatomy) Cabinet [[organ]], a [[passage]] in which the [[tonic]] or [[dominant]] is sustained continuously by one part, while the other [[parts]] move.
Origin: L. [[Organum]], [[gr]].; [[akin]] to [[work]], and E. Work: [[cf]]. [[F]]. Organe. See [[work]], and [[cf]]. Orgue, Orgy.
A fully [[differentiated]] [[structural]] and [[functional]] [[unit]] in an [[animal]] that is specialized for some [[particular]] [[function]].Any [[functional]] [[unit]] of an [[organism]] which combine [[forces]] to perform a common [[role]] en masse.

Revision as of 08:58, 10 May 2008



a group of tissues that perform a specific function or group of functions

Examples of animal organs are heart, lungs, brain, eye, stomach, spleen, bones, pancreas, kidneys, liver, intestines, skin, urinary bladder and sex organs

Examples of plant organs are the roots, stems, leaves, flowers, seeds and fruits

Word origin: L. Organum, Gr.; akin to work, and E. Work: cf. F. Organe.