As a Noun: 1. An ENZYME is a chemical substance in the body which produces changes in other substances without being changed itself. Note: 1. There appears to be no commonly used Auslan sign for ENZYME. The signer in the video is explaining the meaning of this word using simple signs and fingerspelling. If you know a sign for ENZYME used by you or other Auslan users (deaf people or interpreters) please go to "missing sign feedback" and supply details. Thank you.