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O gauge

American  
[oh] / oʊ /

noun

  1. a model-railroad gauge of 1.25 inches (32 millimeters).

  2. Also called Q gauge.  a model-railroad gauge of 1.1875 inches (30 millimeters).

Etymology

Origin of O gauge

First recorded in 1900–05

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A snow scene with O gauge railroad and trains for kids to run.

From Washington Post • Mar. 12, 2010

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.