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motorbus

[moh-ter-buhs]
noun, plural mo·tor·bus·es, mo·tor·bus·ses.
  1. a passenger bus powered by a motor.
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Origin of motorbus

First recorded in 1900–05; motor + bus1
Also called motor coach.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for motorcoach

motorcoach

noun
  1. a coach driven by an internal-combustion engine
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motorbus

noun
  1. a bus driven by an internal-combustion engine
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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