What does the word gas mean?

Usage examples for gas

  1. It's all right up here- the gas has passed over! – With Haig on the Somme by D. H. Parry
  2. Laura, dear, light the gas, please, and Egbert can read the telegrams for himself. – A Knight Of The Nineteenth Century by E. P. Roe
  3. Bedad, she looks well by gas- light! – Records of a Girlhood by Frances Ann Kemble
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