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

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

From BBC • Sep. 18, 2025

The following summer, Crookes played Glastonbury's Pyramid Stage for the first time, bursting into tears at the scale of the occasion.

From BBC • Sep. 18, 2025

According to chairman Mike Crookes, the facility would "blight this area" and the economic impact on tourism could be "profound" and "catastrophic".

From BBC • Oct. 21, 2024

Professor Crookes got in touch with this new medium in December, 1873.

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