TC

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Abbreviation for Tonic-Clonic Seizure. This type of seizure (also called a convulsion) is what most people think of when they hear the word “seizure.” An older term for this type of seizure is “grand mal.” As implied by the name, they combine the characteristics of tonic and clonic seizures. Tonic means stiffening, and clonic means rhythmical jerking.

Merriam-Webster Online Dictionary
Tc (symbol)
technetium
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