Main Entry: hy·per·pla·sia

Pronunciation: \ˌhī-pər-ˈplā-zh(ē-)ə\

Function: noun

Etymology: New Latin

Date: 1861

: an abnormal or unusual increase in the elements composing a part (as cells composing a tissue) — compare benign prostatic hyperplasia

— hy·per·plas·tic \-ˈplas-tik\ adjective