What does parathyroid mean?
Parathyroid most commonly refers to one of the small endocrine glands situated on the back of the thyroid gland in the neck. A person normally has four of them, although the number and position can vary. They secrete parathyroid hormone, a substance that helps regulate calcium and phosphate levels in the blood and supports normal bone and muscle function. The term is also used attributively in expressions such as parathyroid hormone and parathyroid surgery. It is distinct from the thyroid itself: the thyroid produces hormones that regulate metabolism, while the parathyroids primarily help control calcium balance. Disorders can involve excessive or insufficient hormone production, and enlarged glands may sometimes be treated by surgical removal. The word is consequently associated with endocrinology, nutrition, bone health, and diagnostic blood tests rather than everyday conversation.
Any of the small endocrine glands near the thyroid that secrete parathyroid hormone and help regulate blood calcium and phosphate levels.
"The surgeon located an adenoma on one of the parathyroids."
The plural is used when referring to the glands collectively or individually.
Relating to or denoting a parathyroid gland or parathyroid hormone.
"The results indicated a parathyroid disorder."
This use is mainly attributive and technical.
The standard plural is “parathyroids”; “parathyroid glands” is often used when greater anatomical clarity is desired.
"Four parathyroids are usually present, although their number and position can vary."
These thumb-sized glands help control the calcium levels that are essential to bones, nerves, and muscles.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does parathyroid come from?
The name combines the Greek prefix para-, meaning “beside,” with thyroid, referring to the glands’ location beside or on the back of the thyroid gland. Thyroid ultimately derives from Greek elements associated with thyreos, an “opening” or “door,” and eidos, meaning “form,” traditionally linked to the gland’s shield-like shape.
How parathyroid is actually used
This is a specialized medical and anatomical term. It is used mainly in clinical and scientific contexts, especially in discussions of calcium regulation, bone health, and disorders of the glands.
Easily confused with parathyroid
The thyroid is a single, butterfly-shaped gland in the neck, whereas the parathyroids are several much smaller glands attached to or located near it.