The definition of hyperplasia is an abnormal increase in the number of cells in an organ or tissue.(noun)
An example of hyperplasia is when the cells near your heart begin to reproduce so rapidly and abnormally that your organs are impaired due to their enlargement from excessive cell growth.
See hyperplasia in Webster's New World College Dictionary
Origin: ModL < hyper- + -plasia
See hyperplasia in American Heritage Dictionary 4
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