pseudocholinesterase Syllabification: (pseu·do·cho·lin·es·ter·ase)Pronunciation: /ˌso͞odōˌkōləˈnestəˌrās, -rāz/Definition of pseudocholinesterase noun Biochemistry an enzyme present in the blood and certain organs that hydrolyzes acetylcholine more slowly than acetylcholinesterase. pseudocholinesterase in other Oxford dictionaries Definition of pseudocholinesterase in the British & World English dictionary