om·ni·bus (ŏmnĭ-bŭs′, -bəs)
a. A large horse-drawn public conveyance, especially of the late 1800s.
b. A long motor vehicle for passengers; a bus.
2. A printed anthology of the works of one author or of writings on related subjects.
Including or covering many things or classes: an omnibus trade bill.
[French, from Latin, for all, dative pl. of omnis, all; see op- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.