Definition of “Th” - English Dictionary

british dictionary

“Th” in British English

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Thnoun [ C ]

specialized

written abbreviation for thyroid hormone: one of two hormones, T3 and T4, that are produced by the thyroid gland and are important for controlling the metabolic rate (= the speed of chemical processes in the body)

(Definition of “Th” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)