Main Entry: ¹ton·ic

Pronunciation: \ˈtän-ik\

Function: adjective

1 a : characterized by tonus <tonic contraction of muscle> ; also : marked by or being prolonged muscular contraction <tonic convulsions> b : producing or adapted to produce healthy muscular condition and reaction of organs (as muscles)
2 a : increasing or restoring physical or mental tone b : yielding a tonic substance

—ton·i·cal·ly \ˈtän-i-k(ə-)lē\ adverb