Lexikon

in general sense biomass is the mass of material built into living organisms.

In bioengineering biomass is the mass of living cells or tissues growing during the propagation or fermentation process by utilising nutrients.

In agriculture the useful mass of the plants: green leaves, wood, plant products, such as fruits, seeds, etc.

In the moders environmnetal sciences we use the term biomnass in connection with renewable energy sources: the biological material from living, or recently living organisms, such as wood, waste, and alcohol fuels. Biomass is commonly plant matter grown to generate electricity or produce heat. For example, forest residues, yard clippings and wood chips may be used as biomass for energy production. However, biomass also includes plant or animal matter used for production of fibers or chemical substances.