Final answer:
The term 'Cystoscope' is the one that contains the combining form synonymously referring to the urinary bladder, synonymous with 'cyst-' used in medical contexts.
Step-by-step explanation:
The term Cystoscope (option C) contains the combining form that refers to the urinary bladder and is synonymous with cyst-, which is commonly associated with the bladder.
Cystoscope is a medical instrument used to examine the inside of the urinary bladder. The terms Cystectomy (option A) refers to the surgical removal of the bladder, Cystitis (option B) denotes inflammation of the bladder, often due to a bladder infection, and Cystic fibrosis (option D) is a genetic disorder affecting the lungs and other organs, not specifically related to the bladder or its synonyms.