A Biomass is all of the living material in a given area; often refers to vegetation.

(1) the amount of living matter in an area, including plants, large animals and insects;

(2) plant materials and animal waste used as fuel.

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A biomass is "All of the living material in a given area; often refers to vegetation" (EPA 1992, 4).

Other /More definition:
A Biomass is the amount of living matter in a given area, often refers to vegetation

Other /More definition:
A Biomass is 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.

Other /More definition:
Biomass are the organic matter produced by plants and other photosynthetic producers; total dry weight of all living organisms that can be supported at each trophic level in a food chain or web; dry weight of all organic matter in plants and animals in an ecosystem; plant materials and animal wastes used as fuel.