Pronunciation: (bī'ō-mas"), [key]
1. Ecol.the 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. Energy.organic matter, esp. plant matter, that can be converted to fuel and is therefore regarded as a potential energy source.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.