riflescope

The word is a modern compound, transparently combining two established English nouns. 'Rifle' has a martial history, evolving from a verb for plundering to the name for the long gun characterized by its rifled barrel. 'Scope', derived from Greek skopos (watcher, target), became a productive suffix in English for optical instruments like telescope and microscope. The compound 'riflescope' logically follows this pattern, denoting a 'scope' specifically designed for use on a 'rifle', directly describing its function as a telescopic sight for aiming.

Structure: rifle + scope rifle: From Old French rifler 'to scratch, scrape', later 'to plunder'. In English, it came to denote a firearm with a spirally grooved barrel. In this compound, it functions as a noun specifying the object of application. scope: From Italian scopo 'aim, purpose', from Greek skopos 'target, watcher'. In modern English, it is a combining form meaning 'instrument for viewing or observing'.