WordReference Random House Unabridged Dictionary of American English © 2019
bi•o•mass  (bīō mas′),USA pronunciation n. 
  1. Ecologythe 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. Energyorganic matter, esp. plant matter, that can be converted to fuel and is therefore regarded as a potential energy source.
  • bio- + mass 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::

biomass /ˈbaɪəʊˌmæs/ n
  1. the total number of living organisms in a given area, expressed in terms of living or dry weight per unit area

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