A person who wears a mask, especially for protection or disguise. During the carnival, every masker wore elaborate costumes and masks.
A device, material, or agent used to cover, block, or conceal something so that it is not seen, heard, or otherwise detected. Before spraying the car, the technician applied a plastic masker to shield the windows from paint.
In psychoacoustics, a sound that renders another sound less audible by masking it. White noise was used as a masker to obscure the conversation from anyone outside the room.