Definition of "overgrowth"

overgrowth

noun
countable and uncountable, plural overgrowths
1. A usually abundant, luxuriant growth over or on something else. A tangle of growth occurring at the top of trees involving vines and branches, common in jungles.
  Quotations
  In desolate places where dank moisture breeds / The pipy Hemlock to strange overgrowth
  1818, John Keats, “Book I”, in Endymion: A Poetic Romance, London: […] [T. Miller] for Taylor and Hessey, […], page 14, line 241
2. An excessive growth or increase in numbers, as in a population of weeds or microbes.
3. Excessive size; usually caused by over-production of growth hormone from the pituitary gland.