noun.
The total mass of all living things within a specific area, habitat etc.
noun.Vegetation used as a fuel, or source of energy, especially if cultivated for that purpose.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
plant materials and animal waste used as fuel
noun.
the total mass of living matter in a given unit area
Word Usage
" The term biomass is most often encountered in discussions of sources of energy, as biomass can be used to supply energy needs directly (as fuel wood, for example) or indirectly (by being converted to alcohol; see gasohol)."