What it means
The combining form used in words about the thyroid, the butterfly-shaped gland in the front of the neck. hypothyroidismhy-poh-THY-roy-diz-umA condition in which the thyroid gland makes too little thyroid hormone.hypo- below, underthyr/o thyroid gland-ism conditionFull entry is too little thyroid hormone; hyperthyroidismhy-per-THY-roy-diz-umA condition in which the thyroid gland makes too much thyroid hormone.hyper- above, overthyr/o thyroid gland-ism conditionFull entry is too much; a thyroidectomy is surgery to remove the gland; thyroxine (T4) is one of its hormones.
At a glance
| Also written | thyro-, thyroid/o |
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Related terms
hypothyroidism
A condition in which the thyroid gland makes too little thyroid hormone.
hyperthyroidism
A condition in which the thyroid gland makes too much thyroid hormone.