HYPERPLASIA
hyperplasia
(noun) abnormal increase in number of cells
Source: WordNet® 3.1
Etymology
Noun
hyperplasia (countable and uncountable, plural hyperplasias)
(medicine) An increase in the size of a tissue or organ due to increased number of cells.
Source: Wiktionary
Hy`per*pla"si*a, n. Etym: [NL., fr. Gr. (Med. & Biol.)
Definition: An increase in, or excessive growth of, the normal elements of
any part.
Note: Hyperplasia relates to the formation of new elements,
hypertrophy being an increase in bulk of preexisting normal elements.
Dunglison.
Source: Webster’s Unabridged Dictionary 1913 Edition