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Related to standardbred: Saddlebred
stan·dard·bredor Stan·dard·bred (stăn′dərd-brĕd′)
Any of an American breed of trotting and pacing horses developed especially for harness racing by crossing Thoroughbreds with Morgans and other breeds.
[From the fact that in order to be registered as a standardbred, a horse originally had to be able to trot a mile within a standard time of two and a half minutes.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(often cap.) any of an American breed of trotting and pacing horses used for harness racing.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.