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Any part of the embryo which exerts a morphogenetic stimulus on an adjacent part or parts, as in the induction of the medullary plate by the dorsal lip of the blastopore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(embryology), a region in the embryo of chordate animals that exerts an inductive influence on adjacent areas.

The term “organizer,” or “primary organizer,” was introduced by the German embryologist and 1935 Nobel laureate H. Spemann to designate the material of the dorsal lip of the blastopore—the prospective chordamesoderm—in the amphibian gastrula (seeGASTRULA). When transplanted to a remote site, for example, the ventral side of the embryo or the blastocoel, the material of the dorsal lip not only differentiates into organs that would normally arise had the transplant not taken place but also induces the development of neural and other structures in areas adjacent to the transplant site; this is an example of primary embryonal induction (seeINDUCTION). As a result of the action of the organizer, a new, more complex embryo forms in which the organs are situated roughly according to their future distribution.

Two organizers are distinguished. The cephalic organizer consists of the anterior section of the notochord and the material of the prechordal plate and induces formation of the anterior sections of the brain. The trunk organizer, consisting of the remaining material of the notochord and the somites, induces formation of the posterior sections of the brain and the trunk and tail structures. Organizers analogous to amphibian organizers have been found in all classes of chordates; these include Hensen’s node in birds and the posterior section of the embryonal disc in teleosts.

The term “organizer” is also applied to other embryonic organ rudiments that exert an inductive effect on adjacent areas; these are the secondary and tertiary organizers, as distinct from the chordamesoderm, which is called the primary organizer. Thus, the rudiment of the eye that originates as a result of primary embryonal induction is a secondary organizer; it induces formation of the iens in the ectoderm. The lens, in turn, is a tertiary organizer that induces formation of the cornea.

The term “organizer” stresses the concept that it is the rudiments of organs of living embryos that act as inductors and not substances excreted from the tissues of embryos or adults.


Saxen, L., and S. Toivonen. Pervichnaia embrional’naia induktsiia. Moscow, 1963. Pages 21–26. (Translated from English.)
Tokin, B. P. Obshchaia embriologiia. Moscow, 1970. Pages 262–80.
Bodemer, C. Sovremennaia embriologiia. Moscow, 1971. Pages 155–57. (Translated from English.)


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(1) Software that provides a calendar, to-do list and other daily management tools.

(2) A dedicated electronic device that is used to schedule appointments and tasks. Prior to the advent of smartphones, personal information managers (PIMs), which had a fixed number of functions, were very popular. After smartphones, dedicated portable devices such as the PIM, music player and GPS navigation units began to lose favor, because the smartphone could perform all those functions and countless others. See PIM and PDA.

A Computer Is an Organizer
The French word for computer is "ordinateur," which means organizer and is perhaps a better word for a device that is used so much for organization.

Organizer vs. Smartphone
Devices such as this Texas Instruments organizer from the early 1990s (left) were very popular until smartphones came along. The Galaxy Note II (right) is thinner, lighter and can run any of hundreds of thousands of apps and games.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Magtubo also asked the Congress to probe the extrajudicial killing of labor organizers and union activists.
Murtaza Jokhio and Lal Khan Shar have been appointed as organizer and secretary for Shaheed Benazirabad with Tufail Jamali, Rasool Bux Leghari, Ibrahim Bugti, Akhtar Khaskheli and Yousuf Matelo as its members.
The move of the venue to Taipei Nangang Exhibition Center will not only provide exhibitors more spacious booths, but will also enable visitors a more comfortable visiting experience, the organizer said.
To help you keep everything in place, get one of these gadget organizers.
The Major Organizers[R] team is comprised of professional organizers who are highly skilled and well trained at de-cluttering and setting up customized, achievable and sustainable systems in various types of households.
But by the appointment of the new district organizers, his position became untenable.
Meanwhile : Pakistan Tehreek-e-Insaf Provincial Organizers Fazal Muhammad Khan and MPA Dr Haider Ali have directed District Organizers to complete the appointment of Organizers and Deputy Organizers on Town and Tehsil level.
Of course, you won't take the time after every client meeting to redo your tax organizer. You can, however, take a moment to note each client's preference for receiving your organizer, and to record any complaint or suggestion that merits consideration.
These included Boston organizer Lew Finfer in Newsday, Seattle Urban League CEO James Kelly and organizer Tony Lee in The Seattle Post-Intelligencer, Syracuse organizer Andres Dae Keun Kwon in the Syracuse Post-Standard, Little Rock organizer Bill Kopsky in the Arkansas Times, University of Minnesota professor and activist Harry Boyte in the Minneapolis Star-Tribune, labor lawyer and writer Tom Geoghegan, ("Hey Sarah - Organize This") at; Savannah writer Geveryl Robinson in the Savannah Morning News; activist Kathy Olguin in the San Bernadino Sun, El Paso attorney Ouisa D.
One of the boycott organizers, Nativo Lopez, of the Mexican American Political Association (MAPA), said this action would show that illegal aliens have the power "to stop the system." NEWSFLASH: the boycott did not stop the system; the system barely blinked. Sign up for a free monthly newsletter that offers tips on how to be successful as a professional organizer. You can also purchase a book called The Ultimate Guide for Professional Organizers by Maria Gracia on the site.

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