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HO gauge

American  
[eych-oh] / ˈeɪtʃˈoʊ /

noun

  1. a model railroad gauge of 0.65 inch (16.5 millimeters).

Etymology

Origin of HO gauge

h(alf ) O gauge

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.