Which of the following terms is specifically related to the medical term for cough?

The term "tuss/o" is specifically related to cough. In medical terminology, "tussis" is the Latin term for cough, and the combining form "tuss/o" is used in various medical contexts to denote coughing or issues related to coughing.

In contrast, "tympan/o" refers to the tympanic membrane or eardrum, and is related to hearing and the ear. "toxic/o" pertains to toxins and poison, commonly used in contexts discussing toxicology or the effects of poison on the body. "ureter/o" relates to the ureters, the tubes that carry urine from the kidneys to the bladder, and has no connection to respiratory or cough issues. Thus, "tuss/o" is uniquely associated with cough, making it the correct choice in this context.