riflescope

[ rahy-fuh l-skohp ]
/ ˈraɪ fəlˌskoʊp /

noun

a telescopic sight mounted on top of a rifle that helps to improve one's aim by magnifying and pinpointing a target.

Origin of riflescope

An Americanism dating back to 1960–65; rifle1 + scope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019