German mathematician who created the Klein bottle (1849-1925)
"The famous topologist Felix Klein is known for creating a non-orientable surface called the Klein bottle."
United States psychoanalyst (born in Austria) who was the first to specialize in the psychoanalysis of small children (1882-1960)
"The user's definition describes Melanie Klein, but her name is not "klein" as an adjective; it is a proper noun. Therefore, no example sentence can be written using the word "klein" to demonstrate that specific meaning of being a psychoanalyst. The instruction requires the sentence to clearly demonstrate the exact meaning given for the target word, which makes this request impossible to fulfill literally while adhering to the constraints of writing a natural example sentence for the word itself in that context. However, assuming the intent is to illustrate the definition provided using the correct name associated with it: Melanie Klein was the United States psychoanalyst who pioneered the study of small children's minds."
United States fashion designer noted for understated fashions (born in 1942)
"Klein's minimalist collections have become a staple of modern American style since his debut in the early nineteen-seventies."
A surname.
"The Klein family has lived in that neighborhood for three generations."
The word "klein" was borrowed directly from the German language to mean small or little. It entered English usage primarily within specific contexts like the brand name Kleenex rather than replacing the common adjective for size.