Which combining form refers to the mind?

The combining form that refers to the mind is "ment/o." This form comes from the Latin root "mens," which means "mind." It is commonly used in medical terminology in words related to mental processes, conditions, and aspects of psychology, such as "mental," which pertains to the mind and cognitive functions.

In contrast, the other combining forms focus on different meanings: "nat/o" pertains to birth or origin, "leuk/o" refers to white, often in the context of white blood cells (as in leukemia), and "hem/o" relates to blood. Each of these combining forms is used in specific medical terms that reflect their distinct meanings, making "ment/o" the clear choice when addressing concepts tied specifically to the mind.