noun. thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer.
1. Noun, singular or mass You need to be physically active in order to burn calories after a thyroidectomy since your metabolism may have slowed due to the lack of the thyroxine and triiodothyronine in your body.
