Oxford English and Spanish Dictionary, Synonyms, and Spanish to English Translator

Meaning of valveless in English:

‘It is equipped with a patented four-stroke valveless engine and automatic transmission.’

‘Being a valveless instrument, the Alphorn produces only those pitches that occur in the natural overtone or harmonic series.’
‘The low cardiac output manifests as fatigue, while the higher end diastolic pressure is transmitted backwards through the valveless pulmonary veins to the pulmonary capillaries, resulting in exertional dyspnoea.’
‘The device, made of titanium and steel, is a valveless, electrically powered pump that fits directly into the heart's left ventricle and continuously pushes blood throughout the body.’
‘Norrington's line-up is mainly modern, with some period wind instruments and valveless brass.’