What does the word washer mean?

Usage examples for washer

  1. When, therefore, such a pin passes through the nut, lost motion must be taken up by placing an additional or a thicker washer behind the nut. – Modern Machine-Shop Practice, Volumes I and II by Joshua Rose
  2. Are you reflecting on the washer- up, Mr. MacCann? – The Magnetic North by Elizabeth Robins (C. E. Raimond)