randem

adverb

with three horses harnessed together as a team

noun

a carriage or team of horses so driven

Word Origin

C19: probably from random + tandem

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012