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noun Informal.
  1. mayonnaise.

Origin of mayo

by shortening; cf. -o


  1. Charles Horace,1865–1939, and his brother William James, 1861–1939, U.S. surgeons.
  2. a county in NW Connaught province, in the NW Republic of Ireland. 2084 sq. mi. (5400 sq. km). County seat: Castlebar.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for mayo

Contemporary Examples

Historical Examples

  • Are you goin' right back soon's you've got the Doctor, Mr. Mayo?

    Cap'n Eri

    Joseph Crosby Lincoln

  • Mrs. Mayo was with him when the doctor called, and she, too, listened.

    Keziah Coffin

    Joseph C. Lincoln

  • Mrs. Mayo and the doctor's wife championed the cause at sewing circle.

    Keziah Coffin

    Joseph C. Lincoln

  • But wherever you go, you see nothing like the dirt of counties Galway and Mayo.

    Ireland as It Is

    Robert John Buckley (AKA R.J.B.)

  • The semi-savages who in Mayo demand autonomy have no supporters here.

    Ireland as It Is

    Robert John Buckley (AKA R.J.B.)

British Dictionary definitions for mayo


  1. a county of NW Republic of Ireland, in NW Connacht province, on the Atlantic: has many offshore islands and several large lakes. County town: Castlebar. Pop: 117 446 (2002). Area: 5397 sq km (2084 sq miles)


  1. a family of US medical practitioners. They pioneered group practice and established (1903) the Mayo Clinic in Rochester, Minnesota. Foremost among them were William Worrall Mayo (1819–1911), his sons William James Mayo (1861–1939) and Charles Horace Mayo (1865–1939), and Charles's son, Charles William Mayo (1898–1968)
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

Word Origin and History for mayo


shortened form of mayonnaise, first attested c.1930.

Online Etymology Dictionary, © 2010 Douglas Harper

mayo in Medicine


([object Object])
  1. American surgeon who with his brother, Charles Horace Mayo (1865-1939), founded the Mayo Clinic, a renowned medical center in Rochester, Minnesota.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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