Open English Wordnet
Nouns
Adjectives
(a)tonicof or relating to or producing normal tone or tonus in muscles or tissue“a tonic reflex”,
“tonic muscle contraction” (a)tonic, tonalemploying variations in pitch to distinguish meanings of otherwise similar words“Chinese is a tonal language” (a)tonic, accented(used of syllables) bearing the principle stress, usually accompanied by a change in pitch“a tonic syllable carries the main stress in a word” (s)tonicrelating to or being the keynote of a major or minor scale“tonic harmony” 