What does "hyperthyroidism" mean?

The excessive production of hormones by the thyroid.

What is a synonym for "hyperthyroidism"?

Common synonyms include: thyrotoxicosis.

Pronounced //ˌhaɪ̯pəˈθaɪ̯ɹɔɪ̯ˌdɪzəm//.

/ˌhaɪ̯pəˈθaɪ̯ɹɔɪ̯ˌdɪzəm/ noun

noun ·Rare ·Advanced level

Noun

1
The excessive production of hormones by the thyroid. countable, uncountable
2
an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones wordnet
3
The pathological condition resulting from these excess hormones. countable, uncountable

"Tom's girlfriend Mary has hyperthyroidism."

From hyper- + thyroid + -ism.