biomass

n. total weight of an organism in a designated unit of area; total volume of organisms in a designated unit of volume

Biomass refers to living and recently dead biological material which can be used as fuel or for industrial production. Most commonly, biomass refers to plant matter grown for use as biofuel, but it also includes plant or animal matter used for production of fibres, chemicals or heat. Biomass may also include biodegradable wastes that can be burnt as fuel. It excludes organic material which has been transformed by geological processes into substances such as coal or petroleum. It is usually measured by dry weight, and is the total mass of living matter.
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Noun
1. plant materials and animal waste used as fuel
(hypernym) fuel
2. the total mass of living matter in a given unit area
(hypernym) mass

All of the living material in a given area; often refers to vegetation.

Total dry weight of all living organisms that can be supported at each tropic level in a food chain. Also, materials that are biological in origin, including organic material (both living and dead) from above and below ground, for example, trees, crops, grasses, tree litter, roots, and animals and animal waste.