from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having no valves.

from The Century Dictionary and Cyclopedia

  • Having no valve.


from Wiktionary, Creative Commons Attribution/Share-Alike License

valve +‎ -less


  • Research has shown the "valveless" design alone could reduce fuel consumption by 40 percent.

    Latest Articles

  • 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.

    Latest News -

  • 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.

    LPO/Jurowski; Betrothal in a Monastery; Psappha ensemble; SCO/Ticciati – review

  • "Period instrument" does not necessarily equal valveless horn, though, as a visit to the New Queen's website will show.

    Allan, Allan, Allan

  • Sometimes it was the valve closet, sometimes the improved hopper, other times the valveless closet.


  • Meanwhile, the British, ever improving their invention, finally came up with the revolutionary design: George Jennings patented a valveless water closet in 1852, forever getting rid of the annoying valve—what had euphemistically become known as a “dirt trap.”


  • The lubricating oil pump is of the valveless two-plunger type, so geared that it runs at seven revolutions to 100 revolutions of the engine; by counting the pulsations the speed of the engine can be quickly calculated by multiplying the pulsations by 100 and dividing by seven.

    A History of Aeronautics

  • The very desirable feature of being entirely valveless was accomplished with this engine, which is also noteworthy for exceedingly compact design.

    A History of Aeronautics

  • The venous arrangements are also peculiar in that the veins are thin-walled and valveless, and open into the rigid, incompressible sinuses which run between the layers of the dura mater.

    Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.

  • Adelaide pretended to herself to regard Henrietta as an energetic and stimulating person, though she knew that Henrietta's energy, like her own, like that of most women of the sheltered, servant-attended class, was a mere blowing off of steam by an active but valveless engine of a mind.

    The Second Generation


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