peptidoglycan
noun
pep·ti·do·gly·can ˌpep-tə-dō-ˈglī-ˌkan 
: a polymer that is composed of polysaccharide and peptide chains and is found especially in bacterial cell walls
called also mucopeptide, murein
Example Sentences
Recent Examples on the Web That thick layer of peptidoglycan helps hold in a purple dye called crystal violet. 
Beth Mole, Ars Technica, 16 Aug. 2019 By contrast, cells with more complex cell walls consisting of a relatively thin layer of peptidoglycan plus an outer membrane don’t hold in crystal violet as well. Beth Mole, Ars Technica, 16 Aug. 2019 The authors think that the peptidoglycan remains in synovial fluid after the pathogen is gone. Linda Carroll, NBC News, 18 June 2019
Beth Mole, Ars Technica, 16 Aug. 2019 By contrast, cells with more complex cell walls consisting of a relatively thin layer of peptidoglycan plus an outer membrane don’t hold in crystal violet as well. Beth Mole, Ars Technica, 16 Aug. 2019 The authors think that the peptidoglycan remains in synovial fluid after the pathogen is gone. Linda Carroll, NBC News, 18 June 2019 Word History
First Known Use
1966, in the meaning defined above
Medical Definition
peptidoglycan
noun
pep·ti·do·gly·can ˌpep-təd-ō-ˈglī-ˌkan
: a polymer that is composed of polysaccharide and peptide chains and is found especially in bacterial cell walls
called also mucopeptide, murein