the enlargement of an organ or tissue caused by an increase in the reproduction rate of its cells, often as an initial stage in the development of cancer:hyperplasia of the endocrine cells [count noun]:the hyperplasias regressed in five patients
Origin:
mid 19th century: from hyper- 'beyond' + Greek plasis 'formation'
hyperplasia in other Oxford dictionaries
Definition of hyperplasia in the US English dictionary
