Etymology
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biomass (n.)

also bio-mass, "total weight of the organic substance or organisms in a given area," by 1969, from bio- + mass (n.1).

updated on June 01, 2017

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Definitions of biomass from WordNet

biomass (n.)
plant materials and animal waste used as fuel;
biomass (n.)
the total mass of living matter in a given unit area;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.