T3

noun

ˈtē-ˈthrē 

variants or T₃

: triiodothyronine

Examples of T3 in a Sentence

Recent Examples on the Web

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

Now the brand is adding a chief executive officer to its C-suite, with Anish Agarwal, most recently CEO of hair tool brand T3 Micro, being named to the post. — Noor Lobad, Footwear News, 27 May 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