Definition of "valveless" []

• Having no valves. (adjective)

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• "Research has shown the "valveless" design alone could reduce fuel consumption by 40 percent."
• "Research has shown the "valveless" design alone could reduce fuel consumption by 40 percent, said Professor Monika Ivantysynova of Purdue's School of Mechanical Engineering."
• "The outstanding soloist in the concerto was 26-year-old Alec Frank-Gemmill, playing a valveless instrument, as were the obbligato horn section, conjuring misty overtones and harmonics, mellow in mood as well as raw."