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Discover LudwigThe phrase "a third kind of" is correct and usable in written English.
It can be used when categorizing or describing something that belongs to a third category in addition to two previously mentioned kinds.
Example: "In the study of animal behavior, researchers identified a third kind of social interaction that had not been previously documented."
Alternatives: "another type of" or "a different category of".
Exact(53)
A third kind of pumping scheme also possible in lasers is known as up-conversion lasers.
A third kind of ray, designated gamma, consists of high-frequency electromagnetic radiation.
We are still left with a third kind of argument, though.
A third kind of radiation was identified by the French chemist Paul Villard in 1900.
"They use a third kind of angle, a follow-the-money approach," Ms. Mertes said.
A third kind of house call is really an extension of the hospital.
A third kind of public service is the Commission for Public Relief.
There's a third kind of sensor in our eyes, officially discovered in 2002.
"You need a third kind of money that's not humanitarian or development," says Williams.
But there is a third kind of freedom inherent in open-source systems: the freedom to audit.
Similar(1)
The identification of ATOT as the third independent acid base variable has lead some authors to suggest that a third 'kind' of acid base disorder exists [ 41, 42].
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com