V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CSMACD
       Carrier Sense Multiple Access with Collision Detection (IEEE
802.3, ethernet, CSMA/CD), "CSMA/CD"


The Free On-line Dictionary of Computing (30 December 2018):

CSMA/CD

   Carrier Sense Multiple Access / Collision Detect.

   The low level network arbitration protocol used on
   Ethernet.  Nodes wait for quiet on the net before starting
   to transmit and listen while they are transmitting.  If two
   nodes transmit at once the data gets corrupted.  The nodes
   detect this and continue to transmit for a certain length of
   time to ensure that all nodes detect the collision.  The
   transmitting nodes then wait for a random time before
   attempting to transmit again thus minimising the chance of
   another collision.  The ability to detect collision during
   transmission reduces the amount of bandwidth wasted on
   collisions compared with simple ALOHA broadcasting.

   (1995-02-23)