WordReference Random House Unabridged Dictionary of American English © 2015
ab•scis•sion  (ab sizhən, -sish-), 
  1. the act of cutting off;
    sudden termination.
  2. Botany[Bot.]the normal separation of flowers, fruit, and leaves from plants.
  • Latin abscissiōn- (stem of abscissiō). See abscissa, -ion
  • 1605–15

Collins Concise English Dictionary © HarperCollins Publishers::

abscission /æbˈsɪʒən -ˈsɪʃ-/ n
  1. the separation of leaves, branches, flowers, and bark from plants by the formation of an abscission layer
  2. the act of cutting off
Etymology: 17th Century: from Latin abscissiōn-, from ab-1 + scissiō a cleaving

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