What is the root word for bacteria in medical terminology?

The root word for bacteria in medical terminology is "bacteri/o." This combining form is derived from the Greek word "bakterion," which means "small rod" and is used in terms related to bacteria, such as bacteriology (the study of bacteria) and bacteremia (the presence of bacteria in the blood). Understanding this root word is crucial for accurately interpreting and constructing medical terms related to bacterial infections and treatments.

The other options represent different root words with distinct meanings: "tox/o" refers to toxins, "hem/o" pertains to blood, and "erythr/o" relates to red blood cells. Each of these root words has its own specific context in medical terminology, but they do not pertain to bacteria.