overgrowth
  繁茂,蔓延,過度發育
  over·growth /ˈovɝˌgroθ/ 名詞
  生長過度,肥大,過度生長
  o·ver·growth n.
  1. Excessive growth.
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  overgrowth
       n 1: excessive size; usually caused by excessive secretion of
            growth hormone from the pituitary gland [syn: giantism,
             gigantism]
       2: a profusion of growth on or over something else