As a Noun: 1. A RESPIRATOR is a device worn over the mouth and nose to prevent harmful substances like fumes or dust from being breathed into the body. Note: 1. The signer in the video is giving an Auslan explanation of the English term RESPIRATOR. There appears to be no commonly used Auslan sign for RESPIRATOR (but some signers represent this visually using depicting signs, once they have established the topic). If you know a sign for RESPIRATOR used by you or other Auslan users (deaf people or interpreters) please go to "Report missing sign" and supply details. Thank you.