isolator

The word 'isolator' is built upon the verb 'isolate', which entered English in the late 18th century from the Italian 'isolato', meaning 'made into an island'. This traces back to the Latin noun 'insula', meaning 'island'. The core semantic concept is that of separation, as an island is physically separated from the mainland. The suffix '-ator', borrowed from Latin, is a productive agent-forming suffix in English, attached to verbs to denote an entity that performs the action. Thus, an 'isolator' is literally 'that which makes something into an island'—a device or agent that causes separation, whether of electrical current, thermal energy, sound waves, or a person from others.

Structure: isol (isolate) + ator (agent suffix) isol (from Italian 'isolato', meaning 'isolated', itself from Latin 'insula', meaning 'island'); ator (a Latin-derived agent noun suffix, indicating a person or thing that performs an action).