activator

The word 'activator' is a modern English formation built directly upon the Latin root activus, meaning "given to action, energetic." This Latin term itself derives from the verb agere (to do, to drive), which traces back to the Proto-Indo-European root h₂eǵ-, meaning "to drive, lead, set in motion." The suffix -ator is a productive Latin agent-noun ending, used to form nouns indicating an agent or instrument. Therefore, the literal construction "one who/that which makes active" perfectly captures the modern scientific and general meaning of a substance or device that initiates or accelerates a process.

Structure: activ (active) + ator (agent noun suffix) - activ: From Latin activus (active, energetic). In this word, it functions as the adjectival root denoting action or energy. - ator: From Latin -ator (agent noun suffix, denoting a person or thing that performs an action). In this word, it functions as a suffix forming a noun meaning "a thing that does the action of the root."