As a Noun: 1. A DUST MASK is a flexible pad held over the nose and mouth by elastic or rubber straps to protect against dust for example, in construction or cleaning activities. Note: 1. The signer in the video is giving an Auslan explanation of the English term DUST MASK. There appears to be no commonly used Auslan sign for DUST MASK (but some signers represent this visually using depicting signs, once they have established the topic). If you know a sign for DUST MASK used by you or other Auslan users (deaf people or interpreters) please go to "Report missing sign" and supply details. Thank you.