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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