a. 1. Of or pertaining to hyperplasia. [ 1913 Webster ]

2. (Biol.) Tending to excess of formative action. [ 1913 Webster ]

‖n. [ NL., fr. Gr. "ype`r over + &unr_; conformation, fr. &unr_; to mold.] (Med. & Biol.) An increase in, or excessive growth of, the normal elements of any part. [1913 Webster]

☞ Hyperplasia relates to the formation of new elements, hypertrophy being an increase in bulk of preexisting normal elements. Dunglison. [1913 Webster]