Sentence:  Natural gas public utility companies would be given the right of eminent domain , under a bill by Sen. Frank Owen /3 , of El Paso , to acquire sites for underground storage reservoirs for <WSD>gas</WSD> . 
Meaning of the word marked with <WSD> tags:  a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines