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O gauge

[oh] /oʊ/
noun
1.
a model-railroad gauge of 1.25 inches (32 mm).
2.
Also called Q gauge. a model-railroad gauge of 1.1875 inches (30 mm).
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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