Dictionary of Human Evolution and Biology

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Hypertrophy

1. an increase in the size (volume) of individual cells (but not in the number of cells) during normal growth and development of an organism, due to an increase in protein relative to DNA. Hypertrophy increases the surface area of a cell. Cell edema is not hypertrophy.

2. excessive growth or enlargement of an organ or tissue, rather than increased cell number.

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From "Dictionary of Nursing and Individual Health Care"