- tonic detection and tracking, TDT
- tonic labyrinthine reflex
- tonic neck reflex
- tonic receptor
- tonicreflex
- tonic stretch reflex/muscle tonus
- tonifying heart
- tonifying kidney
- tonifying Liver
- tonifying lung
- tonifying method
- tonifying spleen
- tonifying yin
- tonify kidney to secure fetus
- Tonight 80's Talk Show
- Tonight News Paper
- Tonight's Starlight
- Toni Morrison
- toning
- toning curve
- tonkin shuttlefruit
- Tonkin snub-nosed monkey
- Tonle Sap Lake
- Tonle Sap River
- tonnage of traction