What does the word avoirdupois mean?

Usage examples for avoirdupois

  1. Despite the difference in their avoirdupois the two old ladies showed themselves to be what they were- sisters. – Janice Day by Helen Beecher Long
  2. The schoolmaster, occupied with his pupils, and not liking the interruption, hastily, and without further inquiries of the messenger, turned over his Bonnycastle, and arriving at the table of avoirdupois weight, replied, " Tell your father that sixteen drams make an ounce." – Diary in America, Series One by Frederick Marryat (AKA Captain Marryat)