1A person who accentuates something; specifically a person who marks words with written accents.
2A device or substance for accentuating something; a means of accentuation; specifically (a) a device for marking accents and keeping time in music; (b) a garment or device for accentuating a woman's breasts.
accentuator/əkˈsɛn(t)ʃʊeɪtə/ /akˈsɛn(t)ʃʊeɪtə/ /əkˈsɛntjʊeɪtə/
Early 19th century; earliest use found in Robert Bisset (1759–1805), historian and novelist. Either from post-classical Latin accentuator person who marks words with written accents.