T3

noun

ˈtē-ˈthrē 

variants or T₃

: triiodothyronine

Examples of T3 in a Sentence

Recent Examples on the Web

Our tech colleagues at both TechRadar and T3 also agree, and its blistering speed, robust threat protection, and consistently dependable global network are some of its standout features. — Paul Brett, Space.com, 4 Nov. 2026

As a category-defining force in the haircare industry, T3 Micro is known for its design, technology, and performance. — Lydia T. Blanco, Forbes.com, 25 June 2026

Some women may see T3 thyroid hormone decline on IF. — Allison Palmer, Charlotte Observer, 10 June 2026

An August 2025 review in Food Science & Nutrition found IF may lower T3 thyroid hormone in some women. — Allison Palmer, Kansas City Star, 10 June 2026

Word History

Etymology

T, abbreviation for thyronine + 3, number of iodine atoms attached to the thyronine nucleus

First Known Use

1956, in the meaning defined above

Medical Definition

T3

noun

variants or T₃

ˌtē-ˈthrē 

: triiodothyronine