Middle English, from Medieval Latin, from Latin, moon â more at lunar. This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis.ote that some information is displayed differently in the Unabridged. To access the complete Unabridged Dictionary, with an additional 300,000 words that aren't in our free dictionary, start a free trial.
Prevalence and Impact of Thyroid Disease. More than 12 percent of the U.S. population will develop a thyroid condition during their lifetime. 1  An estimated 20 million Americans have some form of thyroid disease. 2  Up to 60 percent of those with thyroid disease are unaware of their condition. Hyperthyroidism, another form of thyroid disease, is a condition causing the gland to produce too much thyroid hormone. 2  Symptoms include irritability, nervousness, muscle weakness, unexplained weight loss, sleep disturbances, vision problems and eye irritation.
The state of normal thyroid function is called euthyroidism. Abnormalities of the thyroid gland are common and affect 1-5% of the population. All thyroid disorders are much more common in women than in men.