A medical condition involving the absence or dysfunction of the thyroid gland.
From Greek 'a-' (without) + 'thyreós' (shield-shaped, referring to the thyroid) + '-osis' (condition), literally 'condition of lacking a thyroid.'
The Greeks called the thyroid 'thyreós' because it's shaped like a shield—when doctors added the '-osis' suffix (disease), they created a word that literally means 'the shield-shaped gland goes missing,' which describes a serious developmental disorder.
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