甲状腺（thyroid）是身体重要的内分泌腺，位于颈部前面。甲状腺的名称来源于希腊语，"甲状"（thyreoeides）指甲状物，因为它的形状像一个甲壳虫。

例句：

The thyroid is a gland located in the neck that produces hormones that regulate the body's metabolism.

My doctor said I have an underactive thyroid and prescribed medication to treat it.

I had my thyroid removed due to a cancerous tumor.