Exogenous

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exogenous

[‚ek′säj·ə·nəs]
(biology)
Due to an external cause; not arising within the organism.
Growing by addition to the outer surfaces.
(physiology)
Pertaining to those factors in the metabolism of nitrogenous substances obtained from food.
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 It might be outdated or ideologically biased.

Exogenous

 

in botany, a term referring to the development of lateral organs in the peripheral cell layers of the main axis of a particular plant organ. Examples of exogenous organs are the leaves that develop in the form of external nodes on the growing point of shoots, root hairs (which are lateral growths of root integuments), and some epidermal growths (trichotomes) of a plant’s aboveground organs.

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