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Webster 1913 Edition

(r?-gr?th′)

Noun.

The act of regrowing; a second or new growth.

Darwin.

The

regrowth

of limbs which had been cut off.

A. B. Buckley.

regrowth ‎(usually uncountable, plural regrowths)

That which has been regrown after removal.
After the forest fire, much of the regrowth consisted of invasive non-native plant species.
The process of regrowing.
The eventual regrowth of the forest to its primeval state will take centuries, if not millennia.

vegetation that returns to an area after the origin vegetation has been removed