What does the word duplex mean?

Usage examples for duplex

  1. April 23, 1873 162, 633 Duplex Telegraphs. – Edison, His Life and Inventions by Frank Lewis Dyer and Thomas Commerford Martin
  2. Unless you like it here in this- this make- believe, double- barrelled, duplex do- funny of a studio thing. – Half Portions by Edna Ferber
  3. On viewing together the system of vessels proper to each heart, they will be seen to exhibit in respect to the body a figure in doubly symmetrical arrangement, of which the united hearts form a duplex centre. – Surgical Anatomy by Joseph Maclise