/ Dictionary / Index P parathyroid hormone: Meaning and Definition of Find definitions for: parathy'roid hor"mone Pronunciation: [key] — Biochem., Physiol. Biochem.,Physiol. a polypeptide hormone, produced in the parathyroid glands, that helps regulate the blood levels of calcium and phosphate. Abbr.: PTH Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. parathyroid gland para-toluidine Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language