Henry Charles Moore, Omnibuses and Cabs — Chapter II (1902)
“ The word "omnibus" was received with marked disapproval by every person to whom Shillibeer spoke concerning his new venture. "If one vehicle is to be called an omnibus, what are two or more to be called?" people said to him. "Omnibuses," Shillibeer replied promptly, but his questioners were horrified, and to their dying days preferred to call them "Shillibeers." Some people called them "omnis," and Mr. Joseph Hume, speaking years later in the House of Commons, created much laughter by referring seriously to the vehicles as "omnibi." ”
