The American Heritage® Dictionary of the English Language, 4th Edition
n. Disintegration of cells into membrane-bound particles that are then eliminated by phagocytosis or by shedding.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival
Word Usage
"She thought of how the word apoptosis meaning “cell death,” came from the Greek word for “falling leaves.”"