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trito-

Third.

Greek tritos, third.

In ancient Greek drama, the tritagonist (Greek agōnistēs, actor) was the person third in importance, after the protagonist and deuteragonist; tritium is a radioactive isotope of hydrogen with a mass approximately three times that of the usual isotope; the tritocerebrum is the third and hindmost segment of an insect's brain. See also tri‑.

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