tonify Syllabification: (ton·i·fy)Pronunciation: /ˈtōnəˌfī, ˈtän-/Definition of tonify verb (tonifies, tonifying, tonified) [with object] impart tone to (the body or a part of it). (of acupuncture or herbal medicine) increase the available energy of (an organ, part, or system of the body). Derivatives tonificationPronunciation: /ˌtōnəfiˈkāSHən/ noun tonify in other Oxford dictionaries Definition of tonify in the British & World English dictionary