cyclopentolate

noun

cy·​clo·​pen·​to·​late ˌsī-klō-ˈpen-tə-ˌlāt, ˌsik-lō- 

: an anticholinergic drug used especially in the form of its hydrochloride C₁₇H₂₅NO₃·HCl to dilate the pupil of the eye for ophthalmologic examination see cyclogyl