(uncountable, usually) The total mass of a living thing or a part thereof (such as a cell).
(uncountable, usually) The total mass of all, or a specified category of, living things within a specific area, habitat, etc.
(uncountable, usually) 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.
Uitgesproken als (IPA)
/ˈbaɪə(ʊ)mæs/
Etymologie (Engels)
From bio- (prefix denoting organic life) + mass (“matter, material”).