[ab-sizh-uhn, -sish-]
the act of cutting off; sudden termination.
Botany. the normal separation of flowers, fruit, and leaves from plants.

1605–15; < Latin abscissiōn- (stem of abscissiō). See abscissa, -ion

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World English Dictionary
abscission (æbˈsɪʒən, -ˈsɪʃ-)
1.  the separation of leaves, branches, flowers, and bark from plants by the formation of an abscission layer
2.  the act of cutting off
[C17: from Latin abscissiōn-, from ab-1 + scissiō a cleaving]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

abscission ab·scis·sion (āb-sĭzh'ən)
The act of cutting off or away.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
abscission   (āb-sĭzh'ən)  Pronunciation Key 
The separation of a leaf, flower, or fruit from a plant as a result of natural structural and chemical changes. ◇ The abscission zone is a layer of weak, thin-walled cells that form across the base of the plant part where the break eventually occurs. A corky layer containing suberin forms beneath the abscission zone to protect the plant.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Thus, following shoot abscission there are two buds adjacent to the aerial shoot scar.
Low levels of ethylene can result in leaf abscission, epinasty and yellowing.
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