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Answer for the clue "Abnormal increase in number of cells ", 11 letters:
hyperplasia

Word definitions for hyperplasia in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context medicine English) An increase in the size of a tissue or organ due to increased number of cells.

Wikipedia Word definitions in Wikipedia
Hyperplasia (from ancient Greek ὑπέρ huper , "over" + πλάσις plasis , "formation"), or hypergenesis , is an increase in the amount of organic tissue that results from cell proliferation . It may lead to the gross enlargement of an organ and the term is ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1861, from Modern Latin hyperplasia , from hyper- + -plasia .

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Hyperplasia \Hy`per*pla"si*a\, n. [NL., fr. Gr. "ype`r over + ? conformation, fr. ? to mold.] (Med. & Biol.) An increase in, or excessive growth of, the normal elements of any part. Note: Hyperplasia relates to the formation of new elements, hypertrophy ...

WordNet Word definitions in WordNet
n. abnormal increase in number of cells

Usage examples of hyperplasia.

The British pathologist, Sir Gordon Roy Cameron, who conducted one of these endeavors, a fellow of the Royal College of Pathologists, later knighted for his contributions to the field, observed that the 1947 study had employed formalin as a fixative agent for the tissues, which is not suitable for cytological studies on account of its tendency to produce artifacts of precisely the kind that had been identified as hyperplasia nodules.

Microscopically the enlargement would seem to be due rather to hyperplasia than to hypertrophy.

In ainhum there is, first, simple hypertrophy, then active hyperplasia The papillae degenerate when deprived of blood supply, and become horny.