A small, butterfly‑shaped gland in the front of your neck that controls how fast your body uses energy. It affects your weight, temperature, and how active you feel.
From Greek 'thyreoeidēs' meaning 'shield‑shaped,' from 'thyreos' (shield) and 'eidos' (form). Doctors first used the term for the thyroid cartilage in the larynx, which looks like a shield. The gland behind it took the same name.
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