Columbia Encyclopedia

Search results

500 results found

human chorionic gonadotropin

(Encyclopedia)human chorionic gonadotropin (HCG): see gonadotropic hormone. ...

progesterone

(Encyclopedia)progesterone prōjĕsˈtərōnˌ [key], female sex hormone that induces secretory changes in the lining of the uterus essential for successful implantation of a fertilized egg. A steroid, progesterone...

aldosterone

(Encyclopedia)aldosterone ălˌdōstĭrōnˈ [key], steroid secreted by the cortex of the adrenal gland. It is the most potent hormone regulating the body's electrolyte balance. Aldosterone acts directly on the kid...

hydrocortisone

(Encyclopedia)hydrocortisone hīˌdrəkôrˈtĭzōnˌ [key], another name for the steroid hormone cortisol, more especially used to refer to preparations of this hormone used medicinally. Hydrocortisone, introduced...

pseudocyesis

(Encyclopedia)pseudocyesis so͞oˌdōsīēˈsĭs [key], imaginary pregnancy in women usually resulting from a strong desire or need for motherhood. In the absence of conception, the menstrual periods nevertheless c...

corticotropin

(Encyclopedia)corticotropin kôrˌtəkōtrōpˈən [key]: see adrenocorticotropic hormone. ...

vasopressin

(Encyclopedia)vasopressin văzˌōprĕsˈĭn [key]: see antidiuretic hormone. ...

osteoporosis

(Encyclopedia)osteoporosis ŏsˌtēōˌpərōˈsĭs [key], disorder in which the normal replenishment of old bone tissue is severely disrupted, resulting in weakened bones and increased risk of fracture; osteopenia...

sleep

(Encyclopedia)sleep, resting state in which an individual becomes relatively quiescent and relatively unaware of the environment. During sleep, which is in part a period of rest and relaxation, most physiological f...

parathyroid glands

(Encyclopedia)parathyroid glands pârˌəthīˈroid [key], four small endocrine bodies, located behind the thyroid gland, that govern calcium and phosphorus metabolism. These four masses of tissue (each about the s...