Which combining form is associated with the word 'below'?

The combining form "infer/o" comes from the Latin root meaning "below" or "beneath." This root is commonly used in medical terminology to describe structures that are positioned lower than other anatomical structures or locations within the body. For instance, terms like "inferior" indicate that something is located below another part, which is critical in understanding human anatomy.

The other options do not convey the meaning of "below." "Cran/o" pertains to the skull or cranial region, "femor/o" relates to the femur or thigh bone, and "dors/o" refers to the back or posterior side of the body. Each of these terms addresses specific anatomical areas but lacks the association with being "below" that "infer/o" provides.