Crookes

American  

[krooks] / krʊks /

noun

1. Sir William, 1832–1919, English chemist and physicist: discovered the element thallium and the cathode ray.

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Crookes British  

/ krʊks /

noun

1. Sir William. 1832–1919, English chemist and physicist: he investigated the properties of cathode rays and invented a type of radiometer and the lens named after him

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Crookes Scientific  

/ krks /

1. British chemist and physicist who discovered thallium in 1861 and invented the radiometer (1873–76). He also developed the Crookes tube, a modified vacuum tube that was later used by W.C. Roentgen and J.J. Thomson in experiments that led to the discovery of x-rays and the electron, respectively.

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Example Sentences

Also added to Boardmasters' line-up are Joy Crookes, Rose Gray and Jacob Alon, who won the Brits' Critics' Choice earlier this month.

From BBC • Jan. 28, 2026

Joy Crookes knows a thing or two about music.

From BBC • Sep. 18, 2025

With their support, and as her mental health improved, Crookes began to rediscover herself.

From BBC • Sep. 18, 2025

Doris Ludlam, 80, Bridget Bourke, 88, Irene Crookes, 79, and Ethel Hall, 86, were being treated on orthopaedic wards where Campbell worked in Leeds in 2002 and developed unexplained hypoglycaemia.

From BBC • Jun. 26, 2025

Professor Crookes sent his observations to the Royal Society, of which he is a member.

From Mysterious Psychic Forces An Account of the Author's Investigations in Psychical Research, Together with Those of Other European Savants by Flammarion, Camille