cambium

[kam-bee-uhm]
noun, plural cambiums, cambia [kam-bee-uh] . Botany.
a layer of delicate meristematic tissue between the inner bark or phloem and the wood or xylem, which produces new phloem on the outside and new xylem on the inside in stems, roots, etc., originating all secondary growth in plants and forming the annual rings of wood.

Origin:
1665–75; < Late Latin: an exchange, barter; akin to Latin cambiāre to exchange

cambial, adjective
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World English Dictionary
cambium (ˈkæmbɪəm)
 
n , pl -biums, -bia
botany See also cork cambium a meristem that increases the girth of stems and roots by producing additional xylem and phloem
 
[C17: from Medieval Latin: exchange, from Late Latin cambiāre to exchange, barter]
 
'cambial
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
cambium   (kām'bē-əm)  Pronunciation Key 
Plural cambiums or cambia
A cylindrical layer of tissue in the stems and roots of many seed-bearing plants, consisting of cells that divide rapidly to form new layers of tissue. Cambium is a kind of meristem and is most active in woody plants, where it lies between the bark and wood of the stem. It is usually missing from monocotyledons, such as the grasses. ◇ The vascular cambium forms tissues that carry water and nutrients throughout the plant. On its outer surface, the vascular cambium forms new layers of phloem, and on its inner surface, new layers of xylem. The growth of these new tissues causes the diameter of the stem to increase. ◇ The cork cambium creates cells that eventually become bark on the outside and cells that add to the cortex on the inside. In woody plants, the cork cambium is part of the periderm. See also secondary growth.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
cambium [(kam-bee-uhm)]

The layer of a tree where growth occurs, just under the bark.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The rest of the cambium layer and bark continue to expand around the injured portion.
The activity of this cambium results in the formation of secondary growth.
A vascular cambium forms in the stele to produce secondary phloem and secondary xylem.
The vascular cambium produces new layers of secondary xylem annually.
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