Which combining form is used to describe muscle in medical terminology?

The combining form used to describe muscle in medical terminology is "muscul/o." This form is derived from the Latin word "musculus," which means little mouse but is used in anatomy to refer to muscles due to their shape and movement. In various medical terms, such as "musculoskeletal," this combining form clearly indicates its relation to muscle tissue.

In contrast, the other combining forms listed do not pertain to muscle. "Mutat/o" is related to mutation or changing forms, making it irrelevant to muscle. "Myc/o" refers to fungus, often used in terms related to fungal infections. "Mydr/i" relates to dilation, particularly of the pupils of the eyes, and is unrelated to muscle. Understanding these distinctions reinforces the proper usage of medical terminology related to muscles.