'Undergrowth' definitions:

Definition of 'undergrowth'

From: WordNet
noun
The brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest [syn: underbrush, undergrowth, underwood]

Definition of 'Undergrowth'

From: GCIDE
  • Undergrowth \Un"der*growth`\, n. That which grows under trees; specifically, shrubs or small trees growing among large trees. --Milton. [1913 Webster]