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O gauge

[oh]
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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).
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Origin of O gauge

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018