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English definition of “Th”

Th

noun [C] // us  // specialized
a 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)Substances and structures in the body
(Definition of Th from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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