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  1. The process by which a cell is engulfed and broken down by another for purposes of defense or sustenance.

  2. The uptake of extracullular materials by the formation of a pocket from the cellular membrane and its subsequent pinching off. Compare endocytosis and pinocytosis.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.