Which combining form represents the color red?

The combining form that represents the color red is "erythr/o." This term originates from the Greek word "erythros," which directly translates to red. It is commonly used in medical terminology to describe conditions, cells, or elements associated with the color red. For example, "erythrocyte" refers to a red blood cell, highlighting its connection to the coloration of blood.

The other combining forms listed do not relate to color. "Fibr/o" pertains to fibrous tissue; "fet/o" relates to the fetus; and "esthesi/o" focuses on sensation or feelings. Each of these forms serves distinct purposes in medical terminology, but none are associated with the color red. Understanding these specific meanings can enhance clarity in communication within medical contexts.