1. Ecology. the amount of living matter in a given habitat, expressed either as the weight of organisms per unit area or as the volume of organisms per unit volume of habitat.
  2. Energy. organic matter, especially plant matter, that can be converted to fuel and is therefore regarded as a potential energy source.


  1. the total number of living organisms in a given area, expressed in terms of living or dry weight per unit area
  2. vegetable matter used as a source of energy

also bio-mass, c.1980, from bio- + mass (n.1).


  1. The total mass of all living things within a given area, biotic community, species population, or habitat; a measure of total biotic productivity.

  1. The total amount of living material in a given habitat, population, or sample. Specific measures of biomass are generally expressed in dry weight (after removal of all water from the sample) per unit area of land or unit volume of water.
  2. Renewable organic materials, such as wood, agricultural crops or wastes, and municipal wastes, especially when used as a source of fuel or energy. Biomass can be burned directly or processed into biofuels such as ethanol and methane. See more at biofuel.

Material in growing or dead plants.

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