Wiktionary
exopolymer
n. (context biochemistry English) Any biopolymer, created by an organism, that is transferred to its external environment
Wikipedia
Exopolymer
An exopolymer is a biopolymer that is secreted by an organism into the environment (i.e. external to the organism). These exopolymers include the biofilms produced by bacteria to anchor them and protect them from environmental conditions.