Wiktionary:Word of the day/2023/March 3

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biomass n

(biology) The total mass of a living thing or a part thereof (such as a cell). The total mass of all, or a specified category of, living things within a specific area, habitat, etc. Organic matter from living things which were recently alive (especially vegetation) used as a fuel or source of energy, especially if cultivated for that purpose; also, fuel produced from such organic matter; biofuel. Today is World Wildlife Day, which is recognized by the United Nations to celebrate and raise awareness of the world’s wild fauna and flora.

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