| tocainide | (noun) antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed | Synonyms: Tonocard |
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| toccata | (noun) a baroque musical composition (usually for a keyboard instrument) with full chords and rapid elaborate runs in a rhythmically free style | - |
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| tocktact | (noun) steady recurrent ticking sound as made by a clock | Synonyms: ticktock, tictac |
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| tocology | (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: midwifery, OB, obstetrics |
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| tocopherol | (noun) a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body | Synonyms: E, vitamin E |
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| tocsin | (noun) a bell used to sound an alarm | Synonyms: warning bell |
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| (noun) the sound of an alarm (usually a bell) | Synonyms: alarm bell |